Quote:
Originally Posted by steve99
Your wasting money buying this (or most other headers) without getting a tune to suit. you will likely only see about 1\3 of the possible gain without a tune.
even most aftermarket catted headers will thow a cel eventually
02 spacer on second 02 sensor may work but its an expensive header and would be wasted without proper tunning
in the tune they will disable cel code P0420 cat efficiency
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If the cat monitor is disabled will this cause the monitor to never set to pass a state I/M?
Reason I ask, my buddy with his EvoX can't pass UT emissions with his tune because it disabled the rear O2 sensor, and although the CEL never comes on, he can't pass the emissions test because the OBD2 computer doesn't show it's ready.
I love the header, but it this is purely for offroad or race use I cannot consider it. Perhaps relocating the O2 to behind the 2nd cat would suffice?