Well I finally decided to quiet my bike and bought an FMF Q and power bomb. I changed my jets and have been messing with my Fuel screw but it just wont run right. I have a 2001 YZ 426 that now has a power band like my old KX 500. Super bog then throw you on your lid burst of power. I am really dissapoited. $500.00+ dollars and it runs so bad I am thinking of just putting the E series back on and selling the thing. Please let me know you ideas or make me an offer on buying it. I ride at Carnegie so need the quiet so the rangers will leave me alone.