De-Tune Before Custom Tune?
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De-Tune Before Custom Tune?
Ok I'm a newb in this area of comps. and pcm but prob. a stupid question. so for say when i pull my egr and air out and find someone local to tune the ses light out for just a lil' cash. then after i install h/c and take it to get a dyno tune will i have to have it tuned back to where it shows the ses light or no?