[CREWZIN]

Sorry. Put me in the non-believer category. You can't buy anything on eBay that going to give you that kind of improvement. If it's the "chip" that they try and sell for just about every car on the planet is does nothing but fool the computer into thinking there's cooler air coming into the throttle body so the timing is advanced and more fuel is added to the intake. It's done with a resistor.