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Difference between 3rd and 4th Gen Cat Backs

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Old 05-13-2002, 12:53 PM
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Car: 1990 RS
Engine: LS1
Transmission: T56
Axle/Gears: 3.73 9 bolt
Difference between 3rd and 4th Gen Cat Backs
What is the difference in these? I mean under the car is all interchangable so shouldnt the exhaust be the same length with the same bends. Reason I am asking is I always see 4th gen cat backs for cheap, but rarely do I see 3rd gen ones for sale.
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Old 05-13-2002, 08:20 PM
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Car: 1990 Pontiac Trans Am
Engine: 355 TPI siamesed runners
Transmission: Tremec T56
Axle/Gears: 12-Bolt 3.73
The part where the cat-back connects to the cat is different. Everything else is really similar. LT1 cat backs are going to be easier to bolt-up than LS1's. But you'll still need some custom work to get it to connect.
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Old 05-14-2002, 11:21 PM
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Car: '85 Z28
Engine: 305
Transmission: WC T5, 3.23 posi
Yep, just the way it bolts to the cat.
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Old 05-15-2002, 09:55 AM
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Car: 1990 RS
Engine: LS1
Transmission: T56
Axle/Gears: 3.73 9 bolt
So that is it. I have no cat so this should work for me then. thanks guys.
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