Weighing an approximate 2.2 lbs this very well constructed unit replaces the stock 8 lb + mid pipe/catalytic converter(boat anchor) on your MV Agusta F4-1000 exhaust system. Significant weight savings and an approximate increase of 4 hp with better low end throttle response. The most affordable and useful performance mod you can do to your MV Agusta. Your F4-1000 will respond better, run cooler plus you get more HP to boot. Can be used with stock headers and stock pipes. Real easy to install. No chip required. Comes with everything you need, including springs