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572 Posts
I currently have a BNR Tune. They send the handheld, you scan the trans and engine and send it out, they adjust it for you to get what you want (ECO, RACE, or other). Not 100% on what they adjust, but they do a great job. Definitely feel the power and my dealership has not said a thing about the tune or any other mods. I don't even flash it back to stock when I take my car in.