Although single throttle system that is adopted on SR20 except for RNN14 can make the engine mechanically simple and keep it lightweight, in terms of response and peak power of the engine, multi-throttle system of RB26 and others works better. We have developed and delivered SR20 engine with 4throttle system for N2silvia race and Formula4 race in the past as an engine constructor. And now, we succeeded in producing high performance and high quality 4 throttle kit in affordable price, by putting together all the experience and stored data through the racing to bring the greatest performance of 4throttle system.