I'm just curious on those that have made custom exhausts. What size and gauge tubing do you use and what do you do for the lip that goes into the exhaust ports that the retainers sit on? Do you just hack off the stock part and weld it on to your new tubing or do something else? I want to experiment with some different ideas and give my TIG'ing some more practice. Just curious on what Trumpets sound like say from a 2-1 setup to a muffler for each cylinder? I've got a Mac 2-1 megaphone on my CM400T due to the stock duals being just completely shot and serious corroded.