m3 stock headers on 325 m54b25
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12-01-2012, 07:08 AM
Join Date: Mar 2005
Location: Columbia, MD
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Why would you need O2 sims if you have cats? I'm confused.
If you put a cat in the system you might as well just run O2 sensors and leave the cats / sensors in all the time.
'02 330Ci - Megasquirt 3 tuned by PFTuning.com
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