What size exhaust pipe? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dwjack · 11-20-2003, 02:42 AM

I've just put on my hedders and am planning on a duel system with a H or X pipe and Borla Sportsman XR-1 mufflers. I am thinking about 3" pipe, I want it to have a deep sound but not too extremely loud. Should I go with 2 1/2" instead to quiet it down or will 3" be OK?

lukecp · 11-20-2003, 03:42 AM

3" is way too big for a stock goodwrench 350. 2.5" is the biggest size i would use....it will sound really deep and throaty. Still, 2.25" is more well suited for a nearly stock engine, but 2.5" will provide you with a deeper and throatier sound

*1FaastC10* · 11-20-2003, 04:08 AM

is your truck a LWB or a SWB? if its LWB, look at Hooker for a bolt on exhaust system. i've got one on my 86 and i love it. its 2 1/4" BTW.

r0lf- · 11-20-2003, 02:59 PM

3" will sound pretty damned mean, but you can say goodbye to torque. A 350 really doesnt need anything over 2.5", going overboard on exhaust diameter is one of my pet peeves.

There was some guy at my HS with a fake 70 Chevelle SS and a full 3" exhaust setup with 1 chamber flowmasters. It was only a little 350, he thought that thing was the sh!t... I just laughed at him. If you want a meaner sounding setup, build a meaner motor.

ocbaud · 11-20-2003, 03:56 PM

i'll be using my current 2.5" exhaust for my new engine. holley says there head kit i'm getting will make about 425hp on a 350 w/ 10:1 comp.

later on i'll be getting some aero chambers. would 3" pipe be overboard for 400 or so hp?

79BIG10 · 11-20-2003, 07:48 PM

I've got 2.5" with an X pipe on mine. I have pics in on my site in the sig along with a sound byte.

r0lf- · 11-21-2003, 12:30 AM

2.5" should be good for 400hp.

J-Spec C10 · 11-21-2003, 04:14 AM

The local hotrod exhaust guy installed 2 1/4" manfold mounted duals on my 305 c10 and it sound awsome and it's also far more responsive now too.

PHOENIX · 11-21-2003, 02:05 PM

A single 3" pipe for a stock 350 shouldnt be too much.
But dual 3" pipes would be too much.

toytruck · 11-21-2003, 02:38 PM

I vote for the 2.5 pipes.

dwjack · 11-22-2003, 11:54 PM

Thanks for all the advise, I'm going to go with 2 1/2" pipes.

11-20-2003, 02:42 AM	#1
dwjack Registered User Join Date: Sep 2003 Location: Alaska Posts: 35	What size exhaust pipe? I've just put on my hedders and am planning on a duel system with a H or X pipe and Borla Sportsman XR-1 mufflers. I am thinking about 3" pipe, I want it to have a deep sound but not too extremely loud. Should I go with 2 1/2" instead to quiet it down or will 3" be OK? __________________ 1984 Silverado C10 GM Goodwrench 350 Edelbrock Intake/Carb Hedman Hedders 700R4 Transmission 12 Bolt out of an 81 275/60/15 Centerlines

11-20-2003, 03:42 AM	#2
lukecp Formerly yellow72custom Join Date: May 2001 Location: Austin, TX Posts: 7,531	3" is way too big for a stock goodwrench 350. 2.5" is the biggest size i would use....it will sound really deep and throaty. Still, 2.25" is more well suited for a nearly stock engine, but 2.5" will provide you with a deeper and throatier sound __________________ '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

11-20-2003, 02:59 PM	#4
r0lf- Hotwheels? Join Date: Dec 2002 Location: Pleasant Hill, CA Posts: 1,145	3" will sound pretty damned mean, but you can say goodbye to torque. A 350 really doesnt need anything over 2.5", going overboard on exhaust diameter is one of my pet peeves. There was some guy at my HS with a fake 70 Chevelle SS and a full 3" exhaust setup with 1 chamber flowmasters. It was only a little 350, he thought that thing was the sh!t... I just laughed at him. If you want a meaner sounding setup, build a meaner motor. __________________ 1978 Money Pit - CUSTOM DELUXE!!!!

11-20-2003, 07:48 PM	#6
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	I've got 2.5" with an X pipe on mine. I have pics in on my site in the sig along with a sound byte. __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

11-21-2003, 12:30 AM	#7
r0lf- Hotwheels? Join Date: Dec 2002 Location: Pleasant Hill, CA Posts: 1,145	2.5" should be good for 400hp. __________________ 1978 Money Pit - CUSTOM DELUXE!!!!

11-20-2003, 04:08 AM	#3
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	is your truck a LWB or a SWB? if its LWB, look at Hooker for a bolt on exhaust system. i've got one on my 86 and i love it. its 2 1/4" BTW.

11-20-2003, 03:56 PM	#5
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	i'll be using my current 2.5" exhaust for my new engine. holley says there head kit i'm getting will make about 425hp on a 350 w/ 10:1 comp. later on i'll be getting some aero chambers. would 3" pipe be overboard for 400 or so hp?

11-21-2003, 04:14 AM	#8
J-Spec C10 Whats this wire for?.... Join Date: Dec 2002 Location: Barrie, Ontario, CANADA Posts: 378	The local hotrod exhaust guy installed 2 1/4" manfold mounted duals on my 305 c10 and it sound awsome and it's also far more responsive now too. __________________ Kyle CANADIAN CONNECTION '82 C10 Resto-Custom--> * 2 1/4" manifold back dual exhaust with Hooker Aerochambers & High Flow Cats Taylor Ignition Wires Centerline 15" Telstars with 32"x10" mudders

11-21-2003, 02:05 PM	#9
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	A single 3" pipe for a stock 350 shouldnt be too much. But dual 3" pipes would be too much. __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

11-21-2003, 02:38 PM	#10
toytruck 5-7 dropped 87 CC Dually Join Date: Sep 2003 Location: bay city mi Posts: 326	I vote for the 2.5 pipes. __________________ I rather be in my 77 Sanger Picklefork Jet Hydro!

11-22-2003, 11:54 PM	#11
dwjack Registered User Join Date: Sep 2003 Location: Alaska Posts: 35	Thanks for all the advise, I'm going to go with 2 1/2" pipes. __________________ 1984 Silverado C10 GM Goodwrench 350 Edelbrock Intake/Carb Hedman Hedders 700R4 Transmission 12 Bolt out of an 81 275/60/15 Centerlines

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