2.5" Exhaust Tubeing to big??? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HotRod929 · 03-19-2003, 04:07 PM

I have 2.25" duals that exit behind the rear axle and I wanted to got to a new exhaust exiting infront of the rear axle at 45 angles. My question is is that would it hurt to make my new exhaust out of 2.5" tubing and have it exit before the rear axle? Thanks

HotRod

yellowgmc · 03-19-2003, 04:12 PM

should be no problem. above that you may run into problems with exhaust velocity on a basically stock 350. otherwise should be ok.

Ackattack · 03-19-2003, 05:08 PM

yeah, 2.5 should work fine. IMO 2.25 that isn't mandrel bent is too small.

crazy longhorn · 03-19-2003, 05:51 PM

actually, the larger the pipe (not mandral bent), but on most exhaust benders will tend to "suck the pipe down " on the bends. 2 1/2 & 3" pipe crush more on the bends than 2 or 2 1/4". 2 1/4" pipe is plenty for a stock 350, & the bends behind the mufflers wont hurt the flow as much as the bends up close to the heat. bigger is louder on the tailpipes, but you can add a set of 3 or 3 1/2x 18" chrome cans to the 2 1/4" pipe & it will sound off ! 3" tail pipes are too loud on my longhorn.......or maybe im getttin too old

crazyL

03-19-2003, 04:07 PM	#1
HotRod929 Registered User Join Date: Mar 2002 Location: Bondurant, IA but in Worcester, MA for school Posts: 767	2.5" Exhaust Tubeing to big??? I have 2.25" duals that exit behind the rear axle and I wanted to got to a new exhaust exiting infront of the rear axle at 45 angles. My question is is that would it hurt to make my new exhaust out of 2.5" tubing and have it exit before the rear axle? Thanks HotRod __________________ 1970 Chevy C-20 350 V-8 Turbo 350 w/ shift kit Dana 60 w/ 4.10 gears AND Powr-Loc POSI New Additions: Summit Headers 135amp alternator Proform HEI Edelbrock 1406 600cfm carb Sunpro Tach Powr-Loc POSI Edelbrock Performer RPM Intake MSD 6A Ignition Box AIM: HotRod929 Visit My Site: http://1970chevy.netfirms.com/

03-19-2003, 04:12 PM	#2
yellowgmc Getting cabin fever?!?!?! Join Date: Oct 2002 Location: chisholm, mn Posts: 1,679	should be no problem. above that you may run into problems with exhaust velocity on a basically stock 350. otherwise should be ok. __________________ Member of the Discs Up Front Club 1972 GMC 1500 1994 F-150 XL 4x4 Tact is for people not whitty enough to be sarcastic

03-19-2003, 05:08 PM	#3
Ackattack Senior Member Join Date: Aug 2002 Location: Valley Center KS Posts: 3,525	yeah, 2.5 should work fine. IMO 2.25 that isn't mandrel bent is too small. __________________ Project Bruiser: 68 Pro-Touring C-10 5.3L / 4L60E Project Ironhide: 97 GMC Crew Cab 4x4 Cummins SOLD: '69 GMC 1/2T SWB TBI'd: Project No Buck Assembly Manual Index Sign up Thread!!! Factory Service Manual Index

03-19-2003, 05:51 PM	#4
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,403	actually, the larger the pipe (not mandral bent), but on most exhaust benders will tend to "suck the pipe down " on the bends. 2 1/2 & 3" pipe crush more on the bends than 2 or 2 1/4". 2 1/4" pipe is plenty for a stock 350, & the bends behind the mufflers wont hurt the flow as much as the bends up close to the heat. bigger is louder on the tailpipes, but you can add a set of 3 or 3 1/2x 18" chrome cans to the 2 1/4" pipe & it will sound off ! 3" tail pipes are too loud on my longhorn.......or maybe im getttin too old crazyL



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