Ok i just installed my skunk2 manifold and the results were irritating. Its slower in low and mid range, but picks up around 5000 and I have to shift at 7k, Its a B18a1 with crower cams, why didnt this make a change for the best? I know you should do more mods with the manifold as throttle body, injectors, and fuel rail. But wouldnt you think it would help anyway? Thanks for any help.