Ones thing is for sure, Do not believe Muzzy's 11% claim. that is total BS. Even there own dyno chart can't back that up. I would not waste my time and money, just take the cat and resonators out and call it good.
there you go....ding ding ding...heavysled wins the prize... that's the answer I was looking for to be posted. since I use stock clutch, I was not going to say it, but as stated, your money is better spent on a upgraded clutch