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09-26-2009, 03:57 PM
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#1 |
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Registered User
 
Join Date: Sep 2008
Location: Limington, ME
Posts: 290
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Exhaust size
What are you guys running for dual exhaust systems? Lookin to see what most guys are running, mine has 2 1/4 seems extremely popular wiht these style trucks, problem is my 4 banger s10 system is louder than my k20 true dual system same exact flowmaster 40 series muffler?? Anyone running a 3 inch system, or will that hurt the motor hp more than help it??
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Once a Marine Always a Marine OOH-RAH GM Fanatic 1982 K20 4" Rancho lift 350cid, edelbrock performer intake 1405 carb, hedman headers, TH350, " Wheres the MUD!!!!!!!!!!" 1986 c30 camper special 454, th400 (for sale) 1984 K10 Big Ten (project) needs motor 1984 C10 355, 700r4, (project) needs shortbox bed |
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09-26-2009, 06:27 PM
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#3 |
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Registered User
Join Date: Dec 2008
Location: Antelope, CA
Posts: 681
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Re: Exhaust size
On my 73 BBC I have Long Tube headers to a stainless summit X-pipe to 3" pipe I cant remember what series of flowmasters to 4 inch tips dumping right over the rear end, it is actually quiet compared to my 77 SBC that just has 2 1/4 to Flowmasters 40 series to turndowns. The X-pipe quiets it down alot, until the cutouts are off.
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Kameron YESTERDAY IS HISTORY - TOMORROW IS A MYSTERY I'm a Middle ClASS HOLE 07.5 Dodge 3500 CTD -- Daily 73 C10 Factory BB SWB 2WD |
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09-26-2009, 08:03 PM
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#4 |
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At the body shop.
Join Date: Aug 2009
Location: Land of fruits and nuts.
Posts: 5,257
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Re: Exhaust size
The engine matters as much as the mufflers. I took some 2 chamber flowmasters off of my 9.5:1 400 sbc because it was too loud and gave them to a friend with a stock bbc and it was quiet
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09-27-2009, 12:19 AM
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#5 |
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Registered User
Join Date: Jan 2009
Location: orangevale, ca
Posts: 3,626
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Re: Exhaust size
i have/had a 3" system on my stock bolt-ons only crate 350 and i KNOW i lost some torque. you need to be putting out some power to run 3" all the way back in my opinion...
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"Dennis the Menace" 1978 Silverado (2wd, 1/2 ton, short bed)complete nut & bolt frame off restomod LQ9/4L80E MY LS SWAP/FRAME OFF BUILD BOOK 2006 TBSS way too much to list 
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09-27-2009, 09:31 AM
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#6 |
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Registered User
Join Date: Mar 2009
Location: Austin
Posts: 61
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Re: Exhaust size
So what would everyone recommend for a pretty much stock 454? 2 1/4, 3?
I believe it has 3 on it now but the pipe is in bad shape and has glasspacks that dump right before the rear axle. Hate the sound of it :\ |
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09-27-2009, 11:57 PM
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#7 | |
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Registered User
Join Date: Mar 2008
Location: Salt Lake City UT
Posts: 441
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Re: Exhaust size
Quote:
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09-28-2009, 11:50 AM
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#8 |
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Registered User
Join Date: Mar 2009
Location: Austin
Posts: 61
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Re: Exhaust size
How will the 2.5 do with a smaller 350 motor is the question now. Plan is to ditch this 454 sooner rather then later but I obviously need an exhaust system until I do that.
I agree that dumping under the truck isn't a good idea but that's how the truck came and its on my fix list 
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09-28-2009, 12:16 PM
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#9 |
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Registered User
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,904
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Re: Exhaust size
Dual 2.5" on a stock/mild 350 is good, I ran dual 3" and lost power, but gained a great sound.
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Jon 1982 Chevy Silverado 350/th350.... RETIRED 1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231 .... Oklahoma Roll Call |
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09-28-2009, 11:38 PM
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#10 |
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Registered User
Join Date: Mar 2007
Location: st louis,mo
Posts: 313
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Re: Exhaust size
I had 2.5" dual run into 3" mufflers. sounded damn near the same as 3" run into the same mufflers. Just not quite as loud.
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'79' shortbed |
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09-29-2009, 08:24 PM
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#11 |
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Slugish
Join Date: Jan 2005
Location: Earlysville, Va.
Posts: 1,024
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Re: Exhaust size
3 in collecter from headers > to 3 in high flow cat > to one flowmaster ( don't know what sereies) 2 2.5 pipes coming out . sounds & performs great . there is something to overkill on to big an exhaust . I would say unless yoiu have 500 plus horses , stay with 2.4-2.5 out the back .
Oh , 408 warmed up , but nothing crazy |
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09-30-2009, 09:23 AM
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#12 |
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On a budget like Fred Sanford
Join Date: Oct 2005
Location: Topeka, KS
Posts: 2,031
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Re: Exhaust size
I'm running 3" duals into super 44's dumped under the bed. I won't be sneaking up on anybody, that's for sure.
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'85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD |
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09-30-2009, 12:08 PM
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#13 |
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Registered User
Join Date: Apr 2009
Location: Waynesfield Ohio
Posts: 1,991
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Re: Exhaust size
Ran 2.5 with 40 series flowmasters on my 350 and didn't change any thing when I went to the 454. Just had to shorten the pipe due to long tube headers but the setup sounds great on both motors
You cant compare a 4 banger to a big block. My Accord also has 2.5 from header back with a 40 series and it is much louder than the truck.
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 1949 Five Window, 1973 Step Side, 2000 Z71 |
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