Just installed a GPR slip on, this is one great unit, got it off eBay for $360 after eBay kicked in a 5% discount. It came in a week with free shipping drop shipped from GPR in Italy to the States. The quality is excellent , looks are great and sound is good, I ran it with and without the rear DB killer, it's quite a bit louder without the DB killer and it doesn't add hardly any performance gain by the butt dyno, so I just put the DB killer back in. It is really not that much louder than stock, it had a European approved DB cert. It also comes with another DB cone insert I did not use. It produces a nice low rumble. I ride a lot in 1st in 25mph zones and it's not a problem at all. This has to be the best price/ performance part upgrade available. You will not be disappointed with GPR quality.
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