FRESCO offers you this model called Factory this exhaust for your motocross YAMAHA YZ 250cc. This exhaust is made of hand-welded sheet steel! The quality and finish are excellent. The cones are designed to deliver maximum performance at low and high rpm. The gain is the same at all engine speeds, compared with the original muffler. Resonance is excellent. This is a very top-of-the-range product. It can be fitted to both the original silencer and the FRESCO carbon silencer, for example. Of course, it's FIM-approved and will fit your bike without a hitch. Supplied without gasket or screws.