Exhaust Exit in front of Axle Questions... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

PrimeredThunder · 07-14-2002, 04:21 AM

Just what the title says. Getting new exhaust put on my 72' short fleet in a couple weeks. Plan on running 2.5" duals with 40 series flows and full length headers. If anyone has experience with running them in front of the axle and exiting at the sides in front of the tires let me know how it worked out. Pics would also be greatly appreciated so I can have an idea what to expect!

Thanks in advance,

Kenny

Brad · 07-14-2002, 05:11 AM

Not the same, but I've got mine running behind the left wheel. 40 series Flowmaster. Another board member thought it was a V8 until I lifted the hood...

Cheyenne Super · 07-14-2002, 08:47 AM

unless you have a strong engine or low rear gear step the exhaust. I lost a lot of low end power when i redid my exhaust from under the bumper to in front of the rear tires. MY problem is i went from 2.25 to 2.5. There is a considerable loss of back pressure do to the one or two bends vs. four or five, not to mention the reduced length. If I had it to do over I would have went down to 2.25 then to 2.5 after the muffler.
I'll get pics later on today.

sbc421 · 07-14-2002, 05:58 PM

Go hear and read this... Exhaust 101

Low69CST · 07-14-2002, 06:40 PM

I've considered this, but i've been told exhaust gases are bad about backing up into the cab, makes your exhaust much louder sitting in the truck and exhaust can flow back under your bed causeing it to rust.

bigvinnie · 07-14-2002, 06:57 PM

what to expect?..... expect to be turning your stereo up a lot louder to hear your music... stick to the smaller pipes to maintain back pressure, especially in a swb truck..

Cheyenne Super · 07-14-2002, 07:19 PM

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Cheyenne Super · 07-14-2002, 07:20 PM

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Cheyenne Super · 07-14-2002, 07:21 PM

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PrimeredThunder · 07-15-2002, 02:55 AM

Thanks for the help, opinions, suggestions, and info etc. The reason for me wanting to go in front of the axle was the overall cost of the project. with the setup I mentioned in the first post I was quoted from $325-$375 including labor and mufflers. Can anyone let me know about how much more exiting behind the rear wheels is going to cost? I really would like to run 2.5" duals with the 40 Series Flows

Kenny

**JIMs70GMC** · 07-15-2002, 05:04 AM

I paid $170 to have 2.5" pipe run from vette manifolds and exit behind the rear wheels at an angle(no pics, yet). For mufflers I bought summit "welded" mufflers, they are chambered mufflers sound alot better than the turbos I had. This was at a local shop they supplied all hangers etc....

What's costing you is the flowmasters, I believe they are around $60 a piece.

greasemonkey · 07-15-2002, 08:15 PM

Mine exit right in front of the tires, and it is loud. Of course I have glasspacks too.

lukecp · 07-15-2002, 09:02 PM

A guy i know ran his exhaust out infront of the rear tires on his '70 Chevy LWB, and he had problems with the heat from the pipes frying his paint. He may have just had cheap paint though.
I hope that $375 quote you got is for headers too. If it was just for an exhaust, sounds like a rip off. I got my exhaust done, 2.5" alluminized pipe, 40 seires Flows, that end above and infront of the rear axle, for $250 with parts and labor. I dont have any tailpipes, my exhaust ends at the outlets of the mufflers. I love it, it sounds really deep and throaty, plus just about everyone turns and looks at my truck when i'm driving it around. I have head flowmasters with tailpipes, and i think mine sounds better. Thats my two cents

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PrimeredThunder · 07-19-2002, 09:07 PM

Thanks again for the help and opinions guys. I still havent decided what I"m going to do as of yet. The lowest I could find was $325 that would be 2.5" pipe from the collectors on the headers to the tailpipes and 40 series muffs plus labor. I'll let ya know what happens when I make a decision.

Kenny

Alexis · 07-19-2002, 09:09 PM

man and i was about to post some picture, oh well, hope you find what you need, keep us posted

crazy longhorn · 07-19-2002, 09:41 PM

A set of 40s flows ,turned out the sides in front of the tires will be extreeemly loud! I tryed that,& cut them off & installed dynmax superturbos. I have Hooker comp headers,2 1/2" pipe/H pipe, turbo muffs,& 3" tail pipes(side exit ,with 4" resonated stainless tips)........still pretty throaty,but not bad enough to have every cop in town stoppin me. as far as price, i set up the system myself(had to "borrow" a buds pipe bender on a couple pcs),But have about $ 400 in parts,from the headers to the stainless tips.....Al

Brad · 07-19-2002, 09:51 PM

I got mine done at Mac's radiator in Portland. I think they have one in Salem also. I was very pleased with there work on the truck, but I wish I would've watched while doing the Camaro-it hangs a little low for my liking.

Sinister · 07-19-2002, 10:20 PM

i've been shying away from this one, cause i didn't want to show this old picture of my truck...
looks better now...
i just redid my exhaust, from the headers back,
for about $75... i got the pipes going out under my doors but you could run em out back by the tires...
what i did was bolt some reducers to my headers, they hook right up, leave you with 2.5" pipe, then you get either 45 degree bent pieces or some down turns depending on the angle you want and some straight pipe, then you just clamp it all together, though you could weld it as well...
like i said i ran out under the doors but you can run em further back...
the clamps are cool cause you can change stuff without having to cut pipes etc.

Sinister · 07-19-2002, 10:22 PM

i've been shying away from this one, cause i didn't want to show this old picture of my truck...
looks better now...
i just redid my exhaust, from the headers back,
for about $75...i used turbo mufflers that were $35 for a pair to replace my glasspacks, i got the pipes going out under my doors but you could run em out back by the tires...
what i did was bolt some reducers to my headers, they hook right up, leave you with 2.5" pipe, then you get either 45 degree bent pieces or some down turns depending on the angle you want and some straight pipe, then you just clamp it all together, though you could weld it as well...
like i said i ran out under the doors but you can run em further back...
the clamps are cool cause you can change stuff without having to cut pipes etc.

sorry about the length of the post...

PrimeredThunder · 07-19-2002, 11:36 PM

Well I am going to call one more shop tomorrow and see what I can find out. Otherwise until my truck funding follows through, it looks like I'm going to have to pick up a couple FlowTech Raptors (Cheap Price

) and have them mounted back by the axle and dumped from turndowns mounted on the muffs until I can afford to get teh flows setup. I remember seeing a member here having pics of this setup, but with flows. If anyone has this pic or one similar please post it.Thanks for the ideas...too many options heh, too bad I can't just wake up and it will be done once and for all, of course I bet alot of us wish that too!

Kenny

jhwkns · 07-19-2002, 11:41 PM

The tailpipe goes straight back from the mufflers and makes a 90 degree turn and exit in front of the tires. I had it done at a local muffler shop about 5 years ago. The headers are cheapies I bought at Super Shop about 5 years ago. It's all held up real well. The pipes were $225 w/turbo mufflers, the headers were on sale for $69.99

jhwkns · 07-19-2002, 11:42 PM

oops I forgot the pic

72Lester · 07-19-2002, 11:57 PM

This may or not be a factor for Oregon, but in '97, F@#d 1/2 tons came with stock exhaust exiting before the wheel and that was the only year they did it. In colder climates the warm condensation collected on the rear wheel and would cause them to freeze up or cause the brakes to freeze. They also had problems with the exhaust "smoking" the left rear wheel so that it always had a brownish tint to it. Like I said may or may not be a factor for you, just something to consider.

I personally think pipes out the side are sweet looking and louder (which is cool)

07-14-2002, 04:21 AM	#1
PrimeredThunder Back from the Dead Join Date: Dec 2001 Location: Salem, Oregon Posts: 522	Exhaust Exit in front of Axle Questions... Just what the title says. Getting new exhaust put on my 72' short fleet in a couple weeks. Plan on running 2.5" duals with 40 series flows and full length headers. If anyone has experience with running them in front of the axle and exiting at the sides in front of the tires let me know how it worked out. Pics would also be greatly appreciated so I can have an idea what to expect! Thanks in advance, Kenny __________________ The only Carb that matters to me is the one under my hood! Salem, Oregon

07-14-2002, 05:11 AM	#2
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,672	Not the same, but I've got mine running behind the left wheel. 40 series Flowmaster. Another board member thought it was a V8 until I lifted the hood... __________________ 1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...

07-14-2002, 08:47 AM	#3
Cheyenne Super Registered User Join Date: Mar 2002 Location: Efland, NC Posts: 303	i have that setup right now unless you have a strong engine or low rear gear step the exhaust. I lost a lot of low end power when i redid my exhaust from under the bumper to in front of the rear tires. MY problem is i went from 2.25 to 2.5. There is a considerable loss of back pressure do to the one or two bends vs. four or five, not to mention the reduced length. If I had it to do over I would have went down to 2.25 then to 2.5 after the muffler. I'll get pics later on today. __________________ 1971 Cheyenne Super Soon to be converted to '68 front clip. Efland, NC

07-14-2002, 05:58 PM	#4
sbc421 Registered User Join Date: Jul 2002 Location: La Porte, TX Posts: 24	Go hear and read this... Exhaust 101 __________________ 1970 Model C10 LWB, Small Block 421 CID, AFR 220 Heads, 1050 Dominator, Super Victor Intake, Comp Cams Mech Roller, Comp Cams ProMagnum Roller Rockers, 13.8:1 Compression, 4500 RPM TCI Converter, TH400 TCI Transmission w/reverse manual valve body w/trans brake, 5.13 Rear Gear on a full Spool, 31-16.50-15 Mickey Thompson ET Streets

07-14-2002, 06:40 PM	#5
Low69CST Registered User Join Date: May 2000 Location: Frankfort, Kentucky, USA Posts: 2,163	I've considered this, but i've been told exhaust gases are bad about backing up into the cab, makes your exhaust much louder sitting in the truck and exhaust can flow back under your bed causeing it to rust. __________________ '69 CST Short fleetside Lowered, 400 small block, 700R4, 4 wheel disc brakes, front sway bar & rear camaro sway bar (in progress) '87 V10 4x4 Short Fleetside Quad Suspension and Dual Tanks

07-14-2002, 06:57 PM	#6
bigvinnie Registered User Join Date: Aug 2001 Location: escondido, ca 92026 Posts: 1,222	what to expect?..... expect to be turning your stereo up a lot louder to hear your music... stick to the smaller pipes to maintain back pressure, especially in a swb truck.. __________________ '72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA 72 Stepside Project

07-14-2002, 07:19 PM	#7
Cheyenne Super Registered User Join Date: Mar 2002 Location: Efland, NC Posts: 303	here are some pics as promised(i hope) . Attached Images __________________ 1971 Cheyenne Super Soon to be converted to '68 front clip. Efland, NC

07-14-2002, 07:20 PM	#8
Cheyenne Super Registered User Join Date: Mar 2002 Location: Efland, NC Posts: 303	another . Attached Images __________________ 1971 Cheyenne Super Soon to be converted to '68 front clip. Efland, NC

07-14-2002, 07:21 PM	#9
Cheyenne Super Registered User Join Date: Mar 2002 Location: Efland, NC Posts: 303	here's the whole truck . Attached Images __________________ 1971 Cheyenne Super Soon to be converted to '68 front clip. Efland, NC

07-15-2002, 02:55 AM	#10
PrimeredThunder Back from the Dead Join Date: Dec 2001 Location: Salem, Oregon Posts: 522	Thanks for the help, opinions, suggestions, and info etc. The reason for me wanting to go in front of the axle was the overall cost of the project. with the setup I mentioned in the first post I was quoted from $325-$375 including labor and mufflers. Can anyone let me know about how much more exiting behind the rear wheels is going to cost? I really would like to run 2.5" duals with the 40 Series Flows Kenny __________________ The only Carb that matters to me is the one under my hood! Salem, Oregon

07-15-2002, 05:04 AM	#11
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	I paid $170 to have 2.5" pipe run from vette manifolds and exit behind the rear wheels at an angle(no pics, yet). For mufflers I bought summit "welded" mufflers, they are chambered mufflers sound alot better than the turbos I had. This was at a local shop they supplied all hangers etc.... What's costing you is the flowmasters, I believe they are around $60 a piece. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm Last edited by JIMs70GMC; 07-15-2002 at 05:08 AM.

07-15-2002, 08:15 PM	#12
greasemonkey Registered User Join Date: Dec 2001 Location: Pace, FL Posts: 2,155	Mine exit right in front of the tires, and it is loud. Of course I have glasspacks too. __________________ 1942 Master Deluxe 1969 C/10 1985 Blazer CUCV 1987 Jimmy 2004 Tahoe 2005 Silverado 1500 2005 Silverado 3500

07-15-2002, 09:02 PM	#13
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	A guy i know ran his exhaust out infront of the rear tires on his '70 Chevy LWB, and he had problems with the heat from the pipes frying his paint. He may have just had cheap paint though. I hope that $375 quote you got is for headers too. If it was just for an exhaust, sounds like a rip off. I got my exhaust done, 2.5" alluminized pipe, 40 seires Flows, that end above and infront of the rear axle, for $250 with parts and labor. I dont have any tailpipes, my exhaust ends at the outlets of the mufflers. I love it, it sounds really deep and throaty, plus just about everyone turns and looks at my truck when i'm driving it around. I have head flowmasters with tailpipes, and i think mine sounds better. Thats my two cents . __________________ '72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg

07-19-2002, 09:07 PM	#14
PrimeredThunder Back from the Dead Join Date: Dec 2001 Location: Salem, Oregon Posts: 522	Thanks again for the help and opinions guys. I still havent decided what I"m going to do as of yet. The lowest I could find was $325 that would be 2.5" pipe from the collectors on the headers to the tailpipes and 40 series muffs plus labor. I'll let ya know what happens when I make a decision. Kenny __________________ The only Carb that matters to me is the one under my hood! Salem, Oregon

07-19-2002, 09:09 PM	#15
Alexis Member since 2000 Join Date: Dec 2000 Location: Mountain View Ca / Mexico Posts: 7,874	man and i was about to post some picture, oh well, hope you find what you need, keep us posted



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07-19-2002, 09:41 PM	#16
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	A set of 40s flows ,turned out the sides in front of the tires will be extreeemly loud! I tryed that,& cut them off & installed dynmax superturbos. I have Hooker comp headers,2 1/2" pipe/H pipe, turbo muffs,& 3" tail pipes(side exit ,with 4" resonated stainless tips)........still pretty throaty,but not bad enough to have every cop in town stoppin me. as far as price, i set up the system myself(had to "borrow" a buds pipe bender on a couple pcs),But have about $ 400 in parts,from the headers to the stainless tips.....Al

07-19-2002, 09:51 PM	#17
Brad Out of the carpool lane. Join Date: Jan 2000 Location: Clark Co, WA Posts: 5,672	I got mine done at Mac's radiator in Portland. I think they have one in Salem also. I was very pleased with there work on the truck, but I wish I would've watched while doing the Camaro-it hangs a little low for my liking. __________________ 1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red 1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!) 2000 Honda VFR in the faster yellow! 2008 Husqvarna TE-610 1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...

07-19-2002, 10:20 PM	#18
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	i've been shying away from this one, cause i didn't want to show this old picture of my truck... looks better now... i just redid my exhaust, from the headers back, for about $75... i got the pipes going out under my doors but you could run em out back by the tires... what i did was bolt some reducers to my headers, they hook right up, leave you with 2.5" pipe, then you get either 45 degree bent pieces or some down turns depending on the angle you want and some straight pipe, then you just clamp it all together, though you could weld it as well... like i said i ran out under the doors but you can run em further back... the clamps are cool cause you can change stuff without having to cut pipes etc. __________________ Beat it to fit, Paint it to match...

07-19-2002, 10:22 PM	#19
Sinister Between Trucks... Join Date: Mar 2002 Location: Los Angeles, CA. Posts: 3,830	i've been shying away from this one, cause i didn't want to show this old picture of my truck... looks better now... i just redid my exhaust, from the headers back, for about $75...i used turbo mufflers that were $35 for a pair to replace my glasspacks, i got the pipes going out under my doors but you could run em out back by the tires... what i did was bolt some reducers to my headers, they hook right up, leave you with 2.5" pipe, then you get either 45 degree bent pieces or some down turns depending on the angle you want and some straight pipe, then you just clamp it all together, though you could weld it as well... like i said i ran out under the doors but you can run em further back... the clamps are cool cause you can change stuff without having to cut pipes etc. sorry about the length of the post... Attached Images __________________ Beat it to fit, Paint it to match...

07-19-2002, 11:36 PM	#20
PrimeredThunder Back from the Dead Join Date: Dec 2001 Location: Salem, Oregon Posts: 522	Well I am going to call one more shop tomorrow and see what I can find out. Otherwise until my truck funding follows through, it looks like I'm going to have to pick up a couple FlowTech Raptors (Cheap Price ) and have them mounted back by the axle and dumped from turndowns mounted on the muffs until I can afford to get teh flows setup. I remember seeing a member here having pics of this setup, but with flows. If anyone has this pic or one similar please post it.Thanks for the ideas...too many options heh, too bad I can't just wake up and it will be done once and for all, of course I bet alot of us wish that too! Kenny __________________ The only Carb that matters to me is the one under my hood! Salem, Oregon

07-19-2002, 11:41 PM	#21
jhwkns Registered Cruiser Join Date: May 2002 Location: Las Vegas NV Posts: 2,230	The tailpipe goes straight back from the mufflers and makes a 90 degree turn and exit in front of the tires. I had it done at a local muffler shop about 5 years ago. The headers are cheapies I bought at Super Shop about 5 years ago. It's all held up real well. The pipes were $225 w/turbo mufflers, the headers were on sale for $69.99 __________________ I intend to live forever. So far, so good.

07-19-2002, 11:42 PM	#22
jhwkns Registered Cruiser Join Date: May 2002 Location: Las Vegas NV Posts: 2,230	oops I forgot the pic Attached Images __________________ I intend to live forever. So far, so good.

07-19-2002, 11:57 PM	#23
72Lester Genuine smartass Join Date: Jun 2002 Location: Enid, OK - soon to be Rapid City, SD Posts: 126	This may or not be a factor for Oregon, but in '97, F@#d 1/2 tons came with stock exhaust exiting before the wheel and that was the only year they did it. In colder climates the warm condensation collected on the rear wheel and would cause them to freeze up or cause the brakes to freeze. They also had problems with the exhaust "smoking" the left rear wheel so that it always had a brownish tint to it. Like I said may or may not be a factor for you, just something to consider. I personally think pipes out the side are sweet looking and louder (which is cool) __________________ '99 Chevy 3/4 Burb 4x4 '98 Chevy 1/2 Short Bed 4x4 Former 67 & 72 owner Wanted: 1972 10 or 20 4X4, V8 4spd

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