Good exhaust, But you will have to have the ECU flashed!!! Bike already comes lean to pass epa BS!!!Adding the exhaust will only make it run leaner..Hello!
What are your thoughts on the M4 GP Exhaust? Read online that even though it's a slip-on, it deletes that stock catalytic and comes with an O2 oxygen sensor bung. Will that get my ECU to start acting funny or idle weird? I'd hate to have to tamper with my ECU.