The exhaust system mounted with no problems and is sturdy. Sounds great. Have the same exhaust on my 400ex & son's 300ex. Buy the FMF power up kit and call FMF to help you get the right jet and your e-clip in the right place for adjustments.
FMF developed the PowerCore4 to increase the horsepower and torque throughout the entire power curve producing a noticeable power increase that is useable and compatible with every style of riding. Aluminum construction and stainless steel Hi-Flo endcaps make for the perfect balance of performance and strength.
Note: For closed course competition use only. Not intended for street use.