C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Reducing 3" exhaust to 2.5"

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Old Apr 8, 2026 | 01:11 PM
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Default Reducing 3" exhaust to 2.5"

I installed ARH 3" longtubes and need to quiet it down. (Mostly need to get rid of the popping from just running the headers and cats). I was wanting to add a Corsa 2.5" catback (Mostly for the tips) to it just wondering if I can add a 3 to 2.5" reducer to transition to the smaller diameter pipes.
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Old Apr 8, 2026 | 04:43 PM
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Sure you can, I did it.
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Old Apr 8, 2026 | 08:37 PM
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Did you do that with your 398?
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Old Apr 9, 2026 | 06:14 AM
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Originally Posted by vetteson
I installed ARH 3" longtubes and need to quiet it down. (Mostly need to get rid of the popping from just running the headers and cats). I was wanting to add a Corsa 2.5" catback (Mostly for the tips) to it just wondering if I can add a 3 to 2.5" reducer to transition to the smaller diameter pipes.
I have the ARH long tubes, X-pipe and cats 3" diameter pipes all the way up to the stock mufflers. I was coming from B&B mufflers and that's how I ended up with all the 3" stainless piping. But the B&B mufflers (which were horrible) had a different bend on them vs the stock mufflers.
I did have to weld some reducers and I had fun with pie cutting and TIG welding stainless to the stock aluminized steel mufflers.
But stock mufflers with headers equal absolutely no drone!
Although I am sure I am leaving some horsepower on the table with the restriction. My ears and head are happy though and it looks stock from the back bumper.
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Old Apr 9, 2026 | 09:04 AM
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Originally Posted by vetteson
Did you do that with your 398?
Yes its just a stepdown after the headers.
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