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      06-07-2020, 11:04 PM   #80
mweisdorfer
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Drives: 2007 Black/Black 335i e90
Join Date: Apr 2011
Location: Holly, MI

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2007 BMW E90 335i  [0.00]
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Quote:
Originally Posted by Lynch View Post
Reviving an old thread because there are so much good information regarding x-pipe, resonators and secondary cats.

Can anyone confirm if the secondary cats compared to resonators do more to 1) dampen the noise and 2) eliminate more rasp/drone?

I am thinking of putting in a 2.5" x-pipe in place of the OEM h-pipe resonator.

I would like to keep the rasp and noise down, so would doing x-pipe only be a good idea?

If secondary cats dampen more noise and block more rasp, doesn't make sense to eliminate them for resonators. Hope someone can explain.
Do you have a sedan or coupe?
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