I noticed someone is selling some Stillen ported (I assume stock) manifolds in the classifieds. I looked at the Stillen website but apparently they are no longer selling them, so I can't find out any info on them. What is the difference in performance between the ported stock parts and the MS parts? How much (in terms of HP or torque) do high perf manifolds add? Is there a certain size turbo or certain "stage" where the benefits become more apparent?
Thanks.
Follow Ups
Stillen ported exhaust manifolds vs. MS mani's - fldc16:31:42 05/18/09