I made the exhaust mod with the "Pro Moto Large Silent Insert" a couple of months ago and I love it. I already had done Daves mods and this gave me more balls and it sounds better. I got the part on ebay for under $20 with shipping. You do have to be carefull because you do need to grind it down pretty thin to make it fit. In the end "no pun intended" itworks great and looks good.