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If you want to get rid of that throttle lag get the sprint booster. JB4 helps get rid of it some but still not as good as sprint booster. Get both and you'll feel even more of a difference. And to answer your last question, only JB4 connects via OBD2 port. Sprint booster connects to the back of your pedal. Sprint booster is very sleek so u could hide it easily and u have the option turn it off.
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