I dont beleive it will make a diffrence. My car when I bought it didnt have one on it. I installed a new one and there was no diffrence at all in the way it ran. It just detects a knock when the engine starts to ping under a load like WOT and sends a signal to set back the timing to keep your engine in one piece. If it is not there it doesnt send a signal and the timing remains the same. That was the way it was explained to me