Thread: E92 335i - stock exhaust sound with gutted cats.
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      09-21-2012, 09:14 PM   #16
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2008 BMW 335i  [10.00]
Quote:
Originally Posted by E90Company View Post
When you gut all the cats you will get signifigant popping, because unburned fuel is exploding upstream in the exhaust.
catless will be the biggest difference when it comes to backfiring
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