Just drilled out my baffle. Bike sounds great however for all of the guys on these forums who say you do not have to tune the bike after you do you need to go in and remap it! Definitely not sorry I did it. But for all the running around to find an extension that matches the one and a half inch hole saw that I needed where I live was quite an ordeal. And the price of having to remap it I guess I could have gotten slip ons!