exhaust
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Junior Member
Joined: Aug 2004
Posts: 5
Likes: 0
From: NJ
Car: 1986 irocz
Engine: 305 TPI
Transmission: automatic
exhaust
Hi does anyone know if a 3 inch exhaust came stock on a 1986 IROC with a 305 TPI engine. The shop I deal with says that this was not put on at factory and must be aftermarket. I am looking to replace exhaust with stock parts and since I purchased car used I am not sure if They are original parts. Thanks
Joined: Jan 2004
Posts: 2,947
Likes: 368
From: Las Vegas
Car: 1987 Formula (original owner)
Engine: 305 TPI
Transmission: T5
Axle/Gears: 9-bolt/3.45
The stock TPI cat was 3" in and 3" out, but the intermediate pipe from the "cat-back" to the muffler was 2 3/4".
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