I am all for someone who wants to build their own stuff. I encourage it actually! If you read 99% of my posts on here is me cutting things up and making my own. But it drives me nuts when people who want to build their own stuff dont want to do it right. So PLEASE!!!!! If you cut the factory muffler up get a fuel tuner of some kind to make it the right Air/fuel ratio. Dont just hack it together and say "look its good now". That just gives everyone who builds their own stuff a bad name. I understand people are trying to save money on things but dont cut corners that will bite you in the tail end later. Ok rant is over LOL
On a side note. I built a exhaust out of a Yoshimura muffler and I love the sound of it. Rodin also built me one out of what looks like a stock muffler. And I have another exhaust on its way from Thailand to test out. All of the mufflers will be individually tuned for the right A/F ratio for the motor with that muffler.