The Akrapovic system is designed for enduro riders who are looking for the finest available aftermarket exhaust systems and know how to get the most out of the increased performance on the track. The system comes with the hexagonal design muffler, which goes great with the sharp lines of your KTM. The system confirms to FIM regulations for exhaust system noise levels. Muffler inserts can be removed . Mounting only possible with SXS factory headers. EXC-F 250 07-10