Parts & Accessories Spare parts For sale: Bullet Cat-Back exhaust system with a custom Max Power muffler. Used for 6 months. The warranty is still valid, with a three-year welding warranty. And a one-year warranty for the muffler, which is the gate for Bullet and Max Power. Of course, the purchase date was a year ago, but the kit has only been used for six months. The kit is an original Bullet X Series version. It fits most models from 2007 to 2018, but I don't think it fits newer models. Selling to the highest bidder.