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.
This
slip on comes with dual carbon fiber canisters and eliminates the stock
catalytic converter. Saves 5lbs over stock and produces 5 more
horsepower. Comes with O2 bung and adapter for running the stock O2
sensor or aftermarket O2 sensors.
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