This is our Watcon Rear exit Exhaust conversion for Yamaha B1 Blaster. Comes with Stainless pipe and flange, Block off for original exhaust outlet hole, and hardware. Sounds better, and lets the exhaust out the back so it does not dryrot your cooling hoses, and make a mess in the pump tunnel. This is for a 701 Blaster, NOT for conversion blaster. See our 3 Blaster rear exhaust for conversion skis. Part # B1-EK