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Old 07-23-2008, 10:26 PM   #90
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Join Date: Jul 2007
Location: Northern Virginia
Posts: 141
My Ride: 02' M3
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Originally Posted by zvinzonz View Post
This is a great idea. Just curious if this only take away the CEL but still won't pass the smog? Or can you also pass smog even with headers?
defoulers are to trick the rear o2's... In no way shape or form will it help you pass emissions! You will 100% fail if you don't put cats further down the line. This of course talking about emission checks where they put a hose on your tail pipe.

e46's have 3 cat's, 2 on the headers and 1 down stream. The one down stream doesnt do too much.

My car only has that 1 cat downstream right now and it stinks really bad! The exhaust temp also went up a LOT. You will defiantly want to buy some(2) universal cats ( jegs or summitracing I've found have good prices). My stock manifold flanges were 2" on my 03 330xi... Im' not sure if all 330's are the same or not. My guess is no.
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