sweet thanx. nah mine is 2 1/4 bummer. i wanna get rid of it because its welded to my stock pipe and is annoying on the freeway. im buying a Border racing Exhaust for my MR2 and have to get rid of it. E-stock rules this year allow for a ful cat-back!! so bye bye supertrapp. it does increase the low end torque quite a bit though and ive seen tones of honda challenge cars with them so i doubt it would slow your engine down that much