sorry, another exhaust ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Troy 82 · 01-21-2003, 07:17 PM

I'm going to have my exhaust done like factory. New y-pipe & single cat, muffler & exit behind the rear tire. This is setup it has now but in 2". I want to go with all 2.5". Will I loose any power hooking it to the stock manifolds wich are 2" "I think"? Or would 2.25" be better? It a stock 350. TES headers are pretty much out of the question do to funds. Thanks.

**Captkaos** · 01-21-2003, 07:31 PM

You want be able to hook up 2.5" pipes directly to the manifolds. 2-1/4" is it. You can run 2.5" but you won't gain anything over the 2.25" with the manifolds. Your exhaust will only flow as much as the smallest restriction.

**swervin ervin** · 01-21-2003, 07:35 PM

Not to disagree with Capt, but I would go with 2.5, since it is single exhaust, you can most definetely use it. This is coming from someone who has fought the loosing battle of single exhaust. My feeling is the 2.5" will help, even if you do only have 2" exhaust manifolds.

**Captkaos** · 01-21-2003, 07:54 PM

OOPS!, missed the single part! In that case, 2.5 would be fine after the Y pipe. I am going with 2.25" off the manifolds and mergine into a 3" on my Jimmy.

bigd65 · 01-21-2003, 10:06 PM

that is the way mine is but after the cat is 3"in

01-21-2003, 07:17 PM	#1
Troy 82 Registered User Join Date: Jan 2003 Location: Texas Posts: 75	sorry, another exhaust ? I'm going to have my exhaust done like factory. New y-pipe & single cat, muffler & exit behind the rear tire. This is setup it has now but in 2". I want to go with all 2.5". Will I loose any power hooking it to the stock manifolds wich are 2" "I think"? Or would 2.25" be better? It a stock 350. TES headers are pretty much out of the question do to funds. Thanks. __________________ Troy 1982 Silverado

01-21-2003, 07:31 PM	#2
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	You want be able to hook up 2.5" pipes directly to the manifolds. 2-1/4" is it. You can run 2.5" but you won't gain anything over the 2.25" with the manifolds. Your exhaust will only flow as much as the smallest restriction. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

01-21-2003, 07:35 PM	#3
swervin ervin You get what you pay for Join Date: Dec 1999 Location: Cherryville, NC Posts: 4,798	Not to disagree with Capt, but I would go with 2.5, since it is single exhaust, you can most definetely use it. This is coming from someone who has fought the loosing battle of single exhaust. My feeling is the 2.5" will help, even if you do only have 2" exhaust manifolds. __________________ Mike 1985 Chevy C-10

01-21-2003, 07:54 PM	#4
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	OOPS!, missed the single part! In that case, 2.5 would be fine after the Y pipe. I am going with 2.25" off the manifolds and mergine into a 3" on my Jimmy. __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

01-21-2003, 10:06 PM	#5
bigd65 Registered User Join Date: Mar 2000 Location: Clute, TX. Posts: 1,935	that is the way mine is but after the cat is 3"in __________________ 2004 Silverado Crewcab 1972 Chevy Monte Carlo 2017 Chevy Tahoe



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