CP-Carrillo Automotive Piston, Set Of 4, Cyl: 4, Material ID: 20x9 Join thousands of discerning BMW

Join thousands of discerning BMW enthusiasts who have transformed their classic 3-Series with authentic Japanese-inspired design that delivers aggressive aesthetics without sacrificing OEM front bumper compatibility

Smoked Light Color - Sporty tinted finish delivers aggressive

5 thread size

Have a helper verify proper function before final installation

CP-Carrillo Automotive Piston, Set Of 4, Cyl: 4, Material ID: 20x9 Join thousands of discerning BMWThe principal function of the piston rings is to form a seal between the combustion chamber and the crankcase of the engine. The goal is to prevent combustion gases from passing into the crankcase and oil from passing into the combustion chamber. During the compression and power strokes, the compression ring seals the combustion gases and prevents blow by. Although blow by is not completely eliminated it is kept to an acceptable limit. During the