[dumb_ricer]

Doesn't suprise me at all.

Back in the 80s/90s, no one put any thought in to forced induction intake manifold designs. Yeah, they maybe made ports slightly larger, change plenums a little over an N/A design, but no real thought went into top end performance.

Now, some companies are doing a shitload of testing different manifolds on honda's trying to beat out the OEM Designs. I'm not sure on the S2k engines, but I know they were having trouble making gains with a K-Series engine intake mani over stock.

I also don't really agree with some of what the "how to build SMIM" sections of books say, but I will never ever be building an intake manifold, so that is a non-point for me.