For what it is worth, I wasted the stock pipe even with a e-line guard on it! Yes a big rock and no I did not crash. Anyhow I ordered a gnarly and it was back ordered so I told my dealer to get me something anything so I cold ride for new years! He got me a Pro circuit, I was ok this will get me by until the gnarly gets here! I was am impressed to say the least. It is much better than stock(03) everywhere. I must tell you that I have not been happy w/ the power on this 03 when compared to a 99 I have. The transition is too quick, too quick revving. It now requires less shifting and the transition is much smoother. I will still try the gnarly but am happy! Try it! MJ