If you put a 4 hole spacer on it, then it will add to the low end power but if you put a open spacer on it then it adds to the top end. My brother has a 400 with a performer that we run a 1 inch open spacer on and makes a big difference. We tried a 1 inch 4 hole spacer and lost .2 of a second. He has a fairly light car and a high stall converter so the top end help but if you have a stock converter and a heavy car then I think the 4 hole would be better. It just depends on the car and the setup you have. Jim Hand likes to run a spacer that divides the primary but leaves the secondary open and this is like having a 4 hole and an open spacer in one.
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