An Exhaust System to improve the characteristics of a Spark ignition engine of Invention of a Cylinder, four stroke, the Exhaust System comprises a Transverse Tube (1),A Chamber (14) and (15); a silenciadoe Extreme with an EXHAUST FLANGE (12) of said Tube transversal adapted for connection to an Exhaust Port of the engine and the other end connected to the Silencer (15); a Silencer (14) connected between the end EXHAUST FLANGE (12 and (d) Icho Silencer (15) at a point that is preferably between 40% and 60% of the lengthD Pipe Cross developed from the face of the EXHAUST FLANGE (12) along the length of the pipe Cross.
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