I installed it on my 08 crf 450r in an effort to eliminate the dreaded cough and die caused by a quick whack of the throttle. It did not stop that particular problem but did seem to clean up the lower end of the power band. It seemed to make an improvement but I'm not sure it's worth the cost. I ride mostly the desert of Southwest Idaho as well as tight wooded trails in the nearby mountains.
Bill L. - September 27, 2011
Really helps with the power band. Worth the money!!!!