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Old 10-11-2012, 02:59 PM
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nyclad nyclad is offline
Officially Welcomed to the 'Fest
Location: Orange County, CA
Join Date: Dec 2007
Posts: 477
Mein Auto: 2002 530i Sport
I have the exact problem with one of my cats on my 2002 530i. It sounds like somebody is running a hammerdrill on a tile floor most of the time.

I even took it to a muffler shop (I know the owner) and we detected it on the 2nd bank (cyl 4-6) of cats. I live in Kalifornia, and just discovered that the CARB (California Air Resources Board) does not allow any aftermarket cats for my year and model. They do list aftermarket for a 2002 330i, but not mine. I have to buy an BMW one. The cheapest I could find one of the genuine BMW cats was for around $650! I'm thinking of just buying it and installing it myself, but I've no clue how hard this would be.
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