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So I may or may not have "borrowed" the prototype for a quick drive to San Diego from Phoenix. I don't have my splitter on yet and I'm missing the fiberglass under panel and had a stock midpipe with muffler delete. We made some trimmings and swapped things out... Mpg increase was subtle but noticeable. I don't know the last time I ever saw numbers tapping 30's in my car. (E30, perfect driving conditions for mpg on a short part of the remainder of the trip). Don't use this as an expected result but... This may be worth it's cost in mpg savings alone hahaha! Mind you I have no muffler so my bumper is a massive parachute. So it will be more drastic on my car than someone with say a stock exhaust. High speed stability on my car was a joke previously. Felt quite nice at *ahem* sufficient speed with the diffuser on.
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