CAT QUESTION?
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Joined: May 2006
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CAT QUESTION?
this weekend i decided to do my cat back exhaust, well after bolting everything up and in place, i realized my cat is a 3" and the flange on the cat back is only 2.5", lovely i know didnt help the situation, anyway i am looking to buy a new cat, does my 89 gta have an air tube on the cat.....
Joined: Mar 2000
Posts: 43,187
Likes: 45
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Why in the world would you change out the larger piece?
Get the right cat back, or if it has a 3" intermediate pipe, modify the connecting flange to 3".
Get the right cat back, or if it has a 3" intermediate pipe, modify the connecting flange to 3".
Joined: Jul 1999
Posts: 10,950
Likes: 26
From: Orange, SoCal
Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
I think you have the wrong cat-back exhaust. All the good ones have a 3" i-pipe. The 2.5" ones are designed for the stock TBI junk.
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