The silencer is a particularly complex accessory to design, since on the one hand it is required to reduce exhaust particles and noise, while on the other hand its presence, which chokes the exhaust pipe, has a negative effect on performance. In a sport in which hundredths of a second count, it is easy to understand how important it is to choose the right silencer, taking into account the many adjustable parameters that can noticeably affect engine performance: these include the external diameter, the shape and diameter of the inner liner, the choice of filter wool, the materials and the spacers used.