I am new to this forum, and also i have a 2007 yamaha VX110 sport. i found old post on here about people doing the hull thru. I want to do it just for the noise and they sound good to me. But what i cant find is how or what do they use to block off the factory exhaust outlet. I have bought the exhaust pieces im going to use from siliconeintakes.com. And i have a 3" hull thru tip with flapper.