Group K is a provider of aftermarket high-performance parts and accessories for various types of automobiles. It specializes in engine modification of personal watercrafts from Yamaha, Sea Doo, Kawasaki, Polaris and Tigershark. Operational for more than 15 years, the company prepares two-stroke engines for several national-level road racing and motorcycle motocross competitions. It also modifies all-terrain vehicles, as well as builds complete race machines. Group K conducts performance tests for machines equipped with its modifications to determine suitable parts for high-speed riding. The company additionally provides online information related to racing carburetors, carb tuning, rear cylinder piston seizures, air leaks, compressions and instruments.