I have always ran FMF on my 2 strokes, but wanted to try something different. Let me tell you all, after running this ProCircuit combo I will NEVER go back to FMF, NEVER!! I went with the platinum and factory sound combo for my YZ125. It really woke up the bike a lot, and you could get way more use out of your powerband. I definatly recommend this to any two-smoker out there!!