FlashPro questions & answers specific to the 2006-2011 Americas Civic Si
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I’ve heard from several people that for intakes over 3” in diameter a tune is required. Hybrid racing and skunk2 both state is the description hondata is required for their 3.5” intakes for the car to run properly. I believe their may be a basemap for 3.5 inch intake in hondata otherwise your car may run a little lean until it has a proper tune.