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 and 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 and high range.Individual preferences must be taken into account when deciding between the Carrera 21 and the Carrera 20. It comes equipped with a good-quality aluminium silencer. Also available in Black, Carbon or Carbon-Kev. Exhaust Muffler Finish: Carbon Exhaust Pipes Finish: Steel Homologation: Not street legal