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      11-30-2021, 12:12 PM   #5
hellokitty
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Drives: '17 M3 ZCP DCT
Join Date: Jul 2010
Location: Southern California

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Quote:
Originally Posted by spdrcrgtr View Post
Right now I have catless downpipes + single mid-pipe ... volume is a bit louder than I want and would like to reduce/eliminate the smell, but curious how the catted downpipes compare against catless from a power/hp standpoint.

I'm sure they produce less power, but how much and any noticeable spool/turbo response differences?

Has anyone tested this and will it help with smell/volume reduction?

Thanks!
I got the AA catted downpipes with GESI UHO Gen 2 cats from Mike @ x-ph over the weekend.

These are the only downpipes that don't lose horsepower when tuned as EACH cat is rated for 850 hp.
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