Quote:
Originally Posted by Poochie
Same here, I almost drunk-ordered a FS downpipe so many times but something ironic kept turning over in my mind beside all the other possible negatives; If the downpipe doesn't cause a CEL, that means that there is really no benefit over stock, so no power gains anyways.
"High flow" cats that are actually flowing at a higher rate than stock cats should trigger a CEL. Why even bother half risking it all for questionable gains..  :
The only real solution if you're going after more power is a balls-out catless DP with a tune to disable the emissions check.. At least then you know exactly what you're getting yourself into without some wary assurances.. |
They don't cause a CEL b/c they fake out the sensors by moving them out--just enough--of the direct exhaust path...
https://f87.bimmerpost.com/forums/sh...3&postcount=56