Engine Pistons Rings Set Compression Ratio 10.7:1 For E90 E60 E83 128i 328i 528i X1 N52 3.0L Engines Pistons Rings Rods Part This engine pistons rings set features a compression ratio of 10.7:1 and is designed for use with E90, E60, E83, 128i, 328i, 528i, X1, and N52 3.0L engines.Constructed from aluminum, the pistons provide efficient heat dissipation and support engine. This product is a third-party replacement.Any use of brand names or model designations is purely to indicate compatibility.