that all depends on how much porting your shop did, my understanding, and this may be wrong, is that the svt manifold is bigger to begin with, not sure on exact sizing but search and you will find it, but also the svt intake in extrude honed from the factory. I think I ve heard that the regular manifold cannot be honed out to match the svt. for the best results get the svt and send it to extrude hone for another pass or two
