'85 305 TPI Exhaust vs. '89 350 TPI Exhaust...Difference?
Thread Starter
Joined: Dec 2012
Posts: 407
Likes: 10
From: Clarksville,TN
Car: 1989 GTA
Engine: 5.7 w/Paxton
Transmission: 700R4
Axle/Gears: 3.27
'85 305 TPI Exhaust vs. '89 350 TPI Exhaust...Difference?
Was there a difference? May have found one complete, but need to know if it is that same. Thanks in advance.
Joined: Dec 2001
Posts: 9,946
Likes: 644
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: '85 305 TPI Exhaust vs. '89 350 TPI Exhaust...Difference?
Same, except for '91 and '92, where the base, LB9 got a more restrictive exhaust.
Member
Joined: Jul 1999
Posts: 268
Likes: 1
From: Milwaukee, WI
Car: 1985 Trans Am/WS6
Engine: 5.0 TPI
Transmission: Auto
Axle/Gears: 3.27
Re: '85 305 TPI Exhaust vs. '89 350 TPI Exhaust...Difference?
'85 had 4-bolt square flange on cat conv. Also, passenger-side A.I.R. tube faces to back of car. Later years face front. Cat. conv. hanger is also different.
I know 'cuz I switched over years ago. Much more available for '86-'92.
Joined: Dec 2001
Posts: 9,946
Likes: 644
From: Chicagoland
Car: 1989 IROC-Z. Original owner
Engine: LB9. Dual Cats. Big Cam
Transmission: World Class T-5
Axle/Gears: BW 3.45
Re: '85 305 TPI Exhaust vs. '89 350 TPI Exhaust...Difference?
I thought he meant generically, ie., exhaust manifolds and pipe diameter.
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