CP Piston & Ring Set for Acura/Honda K20A/A2/A3 - Bore (88mm) - Size (+2.0mm) - CR 9.0

If you're rebuilding the engine in your 2002-2006 Acura RSX, especially for a performance build, a strong set of pistons is crucial. These forged piston and ring sets from CP Pistons are designed for the K20A, K20A2, and K20A3 engines, offering a robust foundation for boosted or high-revving applications. They come in an 88mm bore size, which is a +2.0mm oversize, meaning they're intended for engines that have already been bored out to accommodate larger pistons. The compression ratio is set at 9.0:1, a common target for forced induction setups where you need to manage detonation while still making good power.

CP Pistons are well-known in the performance world for their forged construction. Unlike cast pistons, forged pistons are made from a single block of aluminum that's heated and hammered into shape. This process aligns the grain structure of the metal, making them significantly stronger and more resistant to deformation under extreme heat and pressure. This is exactly what you need when you're pushing your K-series engine beyond its stock limits. The set includes the pistons and rings, ready for installation after your engine block has been machined to the correct bore size.

When installing these pistons, ensure your engine block has been professionally bored and honed to the exact 88mm specification. Proper ring gap and piston-to-wall clearance are critical for performance and longevity, so always refer to CP Pistons' specific installation guidelines or consult with your engine builder. These pistons are not CARB approved and cannot be shipped to California.