just seen your screen name, so for a dbw tb

the RRC and J37 ZDX 78mm tb setup is definatly awesome setup, that loves plenty of air. the adapter is tapered for the backside of the tb to be a smooth transition to the RRC opening, and if you bored the RRC to 70mm and the adapter , with boost I could see even more gains with the right setup. For anyone willing to post before and after dyno graphs id be glad to discount everything even more to see more results.