Muffler/Cat In/Out sizes
Thread Starter
Senior Member
Joined: Dec 2004
Posts: 909
Likes: 1
From: New York
Car: 91 Firebird
Engine: 3.1 V6
Transmission: TH-700-R4
Muffler/Cat In/Out sizes
I need the inlet and outlet sizes of the stock 305 TBI muffler and cat. Do I order the same size or a little bigger?
Joined: Feb 2001
Posts: 13,757
Likes: 560
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
The entire TBI exhaust is 2.25". I would hate to see you spend money on the same size. You won't gain much if not anything at all. You can buy a larger size and just weld on a reducer if need be.
Joined: Jan 2005
Posts: 10,419
Likes: 494
From: Hurst, Texas
Car: 1983 G20 Chevy
Engine: 305 TPI
Transmission: 4L60
Axle/Gears: 14 bolt with 3.07 gears
I would ditch the stock exhaust system from the exhaust port back. Then add shorty headers (meant for a TPI car), Y-pipe, high flow cat, bigger pipes, and a good flowing muffler.
Thread Starter
Senior Member
Joined: Dec 2004
Posts: 909
Likes: 1
From: New York
Car: 91 Firebird
Engine: 3.1 V6
Transmission: TH-700-R4
Actully the only thing that was planned was 14x3 open element with X stream flow top,Hooker aerochamber muffler and dynomax high flow cat.An entire exhaust from headers back is pretty pricey.
Last edited by V8 Slayer; Apr 21, 2005 at 10:04 PM.
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