[carbon777]

I believe the gains would be small plus your going to loose some bottom end torque. To inrease to larger diameter headers usually requires adapter plates and spun offset bolt pattern. A good source for these is Kooks ..... but they are pricey and kinda a pain but they have them. Also remember it will require their gaskets always....... Just thought you should know ..... did this myself a few years ago. Went to 1 7/8 primary tubes. - Carbon777