Exhaust camshaft adjuster compatible with engine models N51, N52, and N55, and vehicle series E81, E87, E88, F20, F21, F22, E90, E91, E93, X3, X5, and Z4.Designed to regulate exhaust camshaft timing for improved engine performance.Matches OEM specifications with part numbers 11367522290 and 11367583208.Constructed for precise fitment and within the variable valve timing system.