http://i55.photobucket.com/albums/g124/FZ1426/636493857110_0_BG.jpg http://i55.photobucket.com/albums/g124/FZ1426/100_0463.jpg http://i55.photobucket.com/albums/g124/FZ1426/100_0464.jpg OMG! How could I have been so naive as to think I was getting good power out of that old PC/Supertrapp POS! This thing is a new bike with this pipe. I can't believe how much better it runs (and sounds) with the Powercore 4. Huge increase in smoothness, roll on power, and rev capability. For those interested FMF 's recommended jetting for sea level 70 degrees is: 155-158 main 65-68 pilot Needle in the fourth position from the top. My settings are: 10.5/1 Wiseco piston 160 main 68 pilot I was running the needle in #3 position, now it's #4 and I think this was a major factor in the performance increase aside from the pipe. Roll on pull greatly increased. For those not too concerned about sound levels this pipe is a "10" for fit, finish and performance.