I got the xtreme and I put in the race inserts...its not that bad....I had the street inserts at first and wanted a little more noise...there should be a couple of posts on here that have sound clips of the xtreme's. One taken up to around 14k rpms on the bike, and the one I did that was done by my friend watching me go down the street, taking it up to about 7-8k in first
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