Quote:
Originally Posted by Vegas_M6_GC
Hi. New to the forum and just doing a search for M6 owners with ESS flash tune. Picked up a '14 M6 GC CP and thinking about bumping it up with ESS flash. Hate the feeling that the new 550ix can kick my butt from 0-60mph. Did you add DP or no? I'm on the fence in getting the Fabworks GESI catted DP or just go stock. May need to consider moving back to Cali and concerned about not passing smog check. I wonder if I have to reflash if I add DPs later?
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Yes if you want to clear CEL from the downpipes.