Yamaha Raptor 660 Slip On Specs: Fits all Raptor 660 year models Simple slip on installation Machined aluminum billet clamp secures system to machine Sleek round can design Tag and tip color choices Years ago we developed a dual exhaust system for the Raptor 660 that was very popular, but the install was advance and required machine modification that some customers preferred not to do. After discontinuing the dual system, we've continued to get calls from customers wanting something for their 660 machine. A team member here at the shop had one that needed a little love, so he brought it in the shop and we came away with a really nice slip on system. A Barker's slip on exhaust is not comparable to your 'run of the mill' slip on pipe in the marketplace. We aren't simply running a straight pipe into a can, making only sound. Our unique megaphone design is guaranteed to improve performance, even with your stock head pipe.