adding a header
#1
adding a header
would adding a header without a tune with the stock cat make the car run lean, and can u add a test pipe with a o2 bung so u dont throw a code and not run lean or do u need tunes for that.
#2
Moderator
Adding a header alone will not make the car run lean. Most people typically don't run into that issue until they have a full header, test pipe, and exhaust. You could throw it on a dyno at that point to check the a/f at that point. As always, some sort of tuning option is best with modifications.
#3
definitely not an issue on ap1's as they run on the rich side at WOT, some ap2's ran a bit leaner in 06+ so I'm not sure how they might be affected.
#6
An intake, header, test pipe, and exhaust made my 2004 run lean and all over the place at WOT. I don't know AFR's prior to these mods as I didn't install the WBO2 until after all these were in place. It would hit over 14:1 at WOT.
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S2000 Naturally Aspirated Forum
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09-07-2012 05:35 PM