I have been shopping around for a slip on for my 96 zx6r. So far I found some good deals on Two Brothers, Scorpion, Micron, Wiley co, And Art. Not sure which one to go with. I want a deep sound to it. Not sure as far as installation, I read that Two Brothers require some cutting of the stock pipe to remove the filter. Is that required of all of them and what would happen if I installed the slip on without cutting that part off? Thanks for your help guys.