Reds Racing have introduced the new 521 GTS Gen2 engine specifically developed for 1:8 nitro GT class. The new 521 GTS Gen2 engine features high power, tuning stability and great fuel mileage. Combined with specific technical changes at the carburettor, combustion chamber and front bearing, this 5 port engine features higher power and better fuel efficiency compared to any other engine. They have developed 3 different combinations for this engine: 521 GTS with steel bearing, 521 GTS with ceramic bearing and 521 GTS Pro Tuned by Mario Rossi with ceramic bearing. You can order all of them with or without pre break-in service.