It’s not a true full custom if you don’t fabricate your very own set of exhaust. But how do you get started? Like most pros, you need a Builder Exhaust Kit which is basically, as the name implies, a selection of pre-fabbed tubing, header flanges and exhaust tips. In other words, everything you need to build a set of pipes for one bike, with enough scraps left over to start on two more (for your next projects or the ones of your friends). Here is what you get for less than $200.00. Two 16-inch-long (350mm) straight sections. Two 3.5-inch radius (90mm) U-bends with straights. Two 5-inch radius 134mm) U-bends with straights. Two Evolution cylinder flanges. Two Shovelhead cylinder flanges. Two Ironhead cylinder flanges. Two fishtail tips. The kit doesn’t include mounting tabs but you can fabricate them out of flat stock, or buy some at any good industrial hardware store. So, what are you waiting for? Biltwell Inc.