This exhaust can be used in combination with the original cylinder as well as with 50-80cc sport cylinders. This product is suitable for the Derbi Senda 50 R Racer 2003 E1 (EBE050) [VTHSENDGB]. Derbi Senda 50 SM DRD Racing 10-13 Malossi MHR Team Modular 79cc Cylinder Kit.