Quote:
Originally Posted by timmydatooth
getting my tomei UEL header installed tuesday! super excited! question do I have to do a tune right after I install them? or am I safe to drive around on the stage 1 tune for a little while?
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If it's catted you're good to go (cat in header that is- the secondary cat does not trip any CEL if removed). If it's catless however, Stage 1 tunes do not disable the P0420 CEL and your car will trip the CEL and go into low power mode and disable the cruise control regularly.
Stage 2 tune does disable the P0420