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      07-21-2010, 03:15 PM   #10
Kroy
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Drives: E90
Join Date: Jul 2009
Location: Los Angeles, CA

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Quote:
Originally Posted by jch8479 View Post
I always run 93, dad mentioned it could be the microfilter. Are those costly to replace? How do u know if your cat is under warranty?
It's easy to check that. Just take apart your cowl to check the filter. Only a few bolts to unscrew. I think the problem is going to be with your cat though.