E46Fanatics - View Single Post - DIY: E46 Header Installation Guide
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Old 06-13-2008, 04:35 PM   #24
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Join Date: Jun 2008
Location: SF
Posts: 607
My Ride: Merlin nonfixed gear
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hey there, so on installing the headers, is the oxygen sensor going to trigger the light on the computer? now that the cats in the stock headers are gone, wont i need to add cats in the mid piping section to pass emissions?


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