ok, well i realize flow numbers wont do it all, and there are other things to consider such as single plane versus dual and your individual cam and heads and all that. basically what im looking for is whether or not it is really worth going to a weiand stealth or other over a performer in my situation. if im only gonna gain 5 hp, its not worth it. do u get what im saying? my setup is stock heads, performer cam, holley 670 carb, 2200 rpm stall converter, 3.55 gears. i still think the performer works better than a stock intake just from the seat of pants feeling, but will anything actually work better for a low rpm power motor. dual plane is probably where i want to stay