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AP03 is a set of two adjusting camshaft gears for BMW N51/N52/N55 engines, designed to precisely set engine timing in selected BMW engines. Kit contents - 2 adjusting camshaft gears. Compatibility and application - Engines: BMW N51/N52/N55. - Models and platforms covered: 1er (E81, E87) with 130i; 3er (E90, E91, E92, E93) with 325i and 330i; 5er (E60, E61) with 523i, 525i, 530i; 6er (E63, E64) with 630i; X1 (E84) xDrive28i; X3 (E83) 2.5 Si and 3.0 Si; X5 (E70) 3.0 Si; Z4 (E86) 3.0 Si and Z4 Roadster (E85) 2.5ii 3.0 Si, including versions with N52/N55 engines. The detailed list also includes Touring and Coupe variants in selected years (full range provided by the manufacturer). OEM numbers - BMW 11367522290 - BMW 11367583208 - BMW 11367552290 - BMW 11367583207 - BMW 11317545959 Origin and context - Country of origin: China (Mainland China). This kit is dedicated to users repairing or tuning the above BMW engines and looking for matched camshaft adjustment components. Thanks to its precise compatibility with the listed OEM numbers and a wide range of supported models, the AP03 is a specific, tailored proposition for valve timing work on N51/N52/N55 engines.