third generation exhaust
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Joined: Jul 2005
Posts: 345
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From: Indiana
Car: 87 trans am
Engine: 350 TPI bored .040 over
Transmission: modified 700r4
Axle/Gears: stock spline, 3.73 Eaton posi
third generation exhaust
does anybody know what the exhaust size is on an 87 trans am where the cat is?
Joined: Feb 2001
Posts: 13,756
Likes: 560
From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
The cat is right under the passenger side seat. IIRC the stock exhaust should be 2.75" for a TPI car. I would just get down and measure it because a previous owner could have changed it.
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