Long Runner or Short Runner?

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I think that there would be less of a difference between the two intakes if you used a blower, they both have the same cross section size and since the air is being forced in the extra 3" of runner length aren't going to amount to too much power lost if your keeping the revs to about 6000. If you wanted to build a block that could rev to say 7000, the track heat would run away.

The biggest difference would be the better performance of the street heat when your not under boost (below 3000 rpms) and when the boost is less than 3 psi.

Personally, if I had an SN95 mustang, I'd get the street heat for the extra torque.