4dr said:the intake manifold could provide less performance on stock motor due to the size causing intake air velocity to drop in the intake. there is such a thing as overkill.
the skunk2 (and most other aftermarket manifolds) are in my opinion failry oversize for most peoples needs when considering a stock z6 or y8 has a damn good intake manifold stock(these will stil work extremely well even for turbo/nitrous cars)
These aftermarket manifolds are for high horse power or high reving(breathing) motors. in which case runner length, design, and plenum volume are things to think about when you are at that level.
then again, everyone wants the "bling."