LeoVince TT system for 50cc standard cylinders and 70cc sports cylinders. Welding on the chamber is not as good quality-wise as on the ZX, meaning this system has similar performance quality, but a cheaper feel. Good torque band and solid performance increase you can feel from 4000rpm up. Good value for money and includes all fixings and manifold gasket. Almost all TT systems have an E-certificate and with a 10% performance gain, are still road legal. Removing the restrictor plate will increase performance, but invalidate the Vehicle Type Approval.