wrong exhaust, any fix?
Thread Starter
Junior Member
Joined: Jul 2025
Posts: 67
Likes: 6
From: Massachusetts
Transmission: 5-Speed
Axle/Gears: 3.45
wrong exhaust, any fix?
Greetings! I bought the Flowmaster 17234 for my 87 IROC. The flare is a little too small for mating the cat. It does mate but is prone to developing a small leak. I should have bought the 17233 with the 3" flare! However, it is installed now. Any bright ideas on how to improve the mating?
Best,
Tom
Best,
Tom
Joined: Oct 2020
Posts: 1,354
Likes: 634
From: Franklin, KY near Beech Bend Raceway, Corvette Plant and Museum.
Car: 1992 Pontiac Firebird
Engine: 5.0L L03 TBI
Transmission: 700R4
Axle/Gears: 2.73
Re: wrong exhaust, any fix?
You need to call them up and order Convertor Pipe part number 26003 and Flange part number SF001 for the Flowmaster American Thunder Cat-back Exhaust System part number 17233.
This will convert your Flowmaster American Thunder Cat-back Exhaust System Part #17234 to Part #17233.
This will convert your Flowmaster American Thunder Cat-back Exhaust System Part #17234 to Part #17233.
Last edited by Airwolfe; Nov 13, 2025 at 02:07 PM.
Thread Starter
Junior Member
Joined: Jul 2025
Posts: 67
Likes: 6
From: Massachusetts
Transmission: 5-Speed
Axle/Gears: 3.45
Re: wrong exhaust, any fix?
You need to call them up and order Convertor Pipe part number 26003 and Flange part number SF001 for the Flowmaster American Thunder Cat-back Exhaust System
part number 17233.
This will convert your Flowmaster American Thunder Cat-back Exhaust System Part #17234 to Part #17223.
part number 17233.
This will convert your Flowmaster American Thunder Cat-back Exhaust System Part #17234 to Part #17223.
Joined: Oct 2020
Posts: 1,354
Likes: 634
From: Franklin, KY near Beech Bend Raceway, Corvette Plant and Museum.
Car: 1992 Pontiac Firebird
Engine: 5.0L L03 TBI
Transmission: 700R4
Axle/Gears: 2.73
Re: wrong exhaust, any fix?
Those two cat back exhaust systems are the same except for the forward portion of the intermediate pipe and the loose flange.
17234_instructions.pdf
17233_instructions.pdf
17234_instructions.pdf
17233_instructions.pdf
Last edited by Airwolfe; Nov 13, 2025 at 02:13 PM.
Thread
Thread Starter
Forum
Replies
Last Post