Coming from Hasi Tuned, brand of multi-time World Championship finalist Silvio Hächler, is a new O.S. Max R21 based nitro on-road engine. The power plant is modified with the specifications of Silvio and professionally tuned, offering a differently timed crankshaft, a modified case and sleeve. The specifications aim to increase speed, giving extra power over the whole RPM range. This type of engine is a perfect choice for small tracks or for beginner drivers who want a surplus of power compared to the standard engine.