Thread: ar design TRUE 3" Downpipes!
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      08-17-2010, 06:02 AM   #33
ar design
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Drives: 04 M3
Join Date: Jan 2008
Location: Denver, CO

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Quote:
Originally Posted by BrokenVert View Post
So then you just put the factory o2 sensors right onto the catted dps?
Correct. No DP Fix at all was needed to pass here in Colorado, and I had zero CEL issues with my 2007, pre 29.2 car.
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