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Old 07-26-2008, 12:05 PM   #95
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Join Date: Jul 2007
Location: Northern Virginia
Posts: 141
My Ride: 02' M3
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Originally Posted by Boostin FD View Post
so you need 4 of those non-foulers for M3, since there are 2 rear 02 sensors?
Thats correct. The DIY says 2 short (1 package) and 2 long ( 1 package). Although I think you may be able to get away with 2 shorts for clearance issues.

You will need to drill two of them out to 1/2" so the o2's will screw in all the way. Don't just stick a 1/2 bit on an start going.. you will need like 3 sizes in-between to gradually get larger.
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