The issue as I see it is with the exhaust gains using the stock exhaust manifolds which have the diameter of a QUARTER... There must be some reason for this. Now since you (4DR) are running bigger turbos, perhaps increasing the breathing on exhaust may help you, vs stock... I do think that porting the intake portion will be beneficial to all, but likely even better for you.. Porting does no good if your entire engine doesn't need the extra flow...