MAHLE Original® PC479 Fire-PowerT piston ring sets are engineered to withstand the punishment of today's high powered nitrous oxide injected, turbocharged and supercharged race applications. PC479 compression rings will provide superior ring durability, stable radial tension, superior combustion sealing and oil control, while protecting the cylinder walls. All these benefits will net additional horsepower while extending engine life. MAHLE Original PC479 Fire-PowerT rings can be purchased in boxed engine sets as well as open stock to meet your performance requirements.