YFZ450R Rossier Performance Package

The Rossier full exhaust really wakes up the fuel injected YFZR. Rossier increase the peak power from 38 and change to an honest 47. Rossier also completely eliminate the stock sag at 3800 RPM that is present with the stock pipe. Couple that with the ability to rev all the way to 10,000 rather than nosing over at 8500, and you can see Rossier has a killer pipe here. Fuel injected engines need fuel mixture adjustments to compensate for increased power levels. This will require a Dynojet Power Commander or similar unit allowing for re-programming the stock ECU. We can sell you a properly pre-programmed Power Commander.