The Carrera 20 and Carrera 21 are a fully High-End exhaust systems which must be combined with a competition cylinder of at least 70 cc. The body of the Carrera 20 is a bit shorter than the Carrera 21, which provides it with more power in the mid range & slightly lower performance in the high range. As a result, the Carrera 20 does not reach such fast top speeds, but it is superior in terms of acceleration. The Carrera 21 delivers excellent results in the mid & high range. Individual preferences must be taken into account when deciding between the Carrera 21 & the Carrera 20. It comes equipped with a good-quality aluminium silencer. Also available in Black, Carbon or Carbon-Kev. Article: YASUNI Carrera 21 Exhaust, black