The Yoshimura Pro System is the tip of the line exhaust system for your dirt bike and quad. CNC bent titanium tubing, hand welded contruction, and hand packed titanium sleeve muffler are all the top quality features you will find on the Pro System. The Pro Sustem is for the serious racer who wants maximum performance and weight reduction. All Pro Systems come with a 2-piece end cap which has a 98DB spark arrestor insert. TEC-KIT option has a 96DB and 93DB quiet inserts which are USFS approved.