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AST Suspension 5100 Series Coilovers (Excludes Front/Rear Top Mounts) (Non Inverted) - 1999-2007 BMW 3 Series 320d Sedan/Touring/Coupe/Convertible (E46) spl-parts-rear-sway-bar-end-links Part Number BWF19XZ Part NameThe 5100 Series shock absorbers for the 1999 2007 BMW 3 Series 320d Sedan Touring Coupe Convertible (E46) utilize non inverted high performance monotube technology. In the past, these were known as the 4100 series. Monotube design shocks absorbers give your car a better performance than the standard twin tube design, the gas pressure is separated by a floating piston, and eliminates cavitation and airation within the oil chamber. The 5100 Series