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Comments On Aug 04, 2009:This Ultra Silent Insert fits great into the end cap, and it is secured with one simple screw. Although it did not have as much sound-dampening qualities as I had expected, it still quieted it down a little. There was virtually no noticeable power loss at my elevation, but when riding in higher areas, it definitely did not run very good and robbed power. Re-jetting may have to be done. Good product overall.
Additional Comments On Aug 31, 2009:Product used on a 2007 CRF150R.
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