M4 Slip On Exhaust System 2009-2014 Yamaha R1
For 2009, yamaha made a radical change to the popular R1 with their new "Big Bang" motor. M4 has gone to work to offer an exhaust system that lowers weight, increases horsepower and gives a more aggressicve look. We offer undertail slip ons in either carbon fiber or titanium.Standard slip on system retains stock catalytic converter. Produces 3.6 horsepower over stock.