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Originally Posted by 335if30uae
thanks .. running with JB4 stage 2 -its great... but feels stock cat and dp is restrictive...at the same time if challenger HFC dp throws codes.. it a worry for me.. I will wait till more are installed..
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We have about 15-20 HFC downpipes out there with no CEL. I have only seen once customer so far that has had it pop up. It would only come on every once any awhile though. Unfortunately BMW changes software versions often and sometimes changes O2 sensor sensitivity so we can never guarantee no CEL but so far its looking good