I haven't spent a lot of time comparing intake manifolds. I'm sure there are some differences in hp numbers but how much, really? I've always been of the opinion that most of that is just dyno numbers. My guess is that you could swap from one manifold to the other, drive them back to back, and would be hard pressed to tell the difference. If you are setting a land speed record, or a national et record it may be worth getting down to that detail. Just my 2 cents worth. I'd run the one that I could get the best deal on.
