6pcs N55B30 N55B30A Engine Pistons and Rings Set STD Bore 84mm 11258619196 for F20 F21 F30 F10 X3 X4 X5 X6 3.0L L6 Twin turbo Material: forged aluminum Bore Size: 84mm STD Piston Ring Thickness: 1st 1.2mm, 2nd 1.5mm, 3rd 2.0mm Rod Diameter: Φ22mm Rod Length: 54mm Compatibility: F20 F21 F30 F10 X3 X4 X5 X6 3.0L L6 Twin turbo This piston and ring set is designed for 3.0L L6 Twin turbo engines, specifically matching OEM specifications for precise fitment.The forged aluminum construction supports enhanced engine performance under increased load conditions.With a standard 84mm bore and Φ22mm rod diameter, the components are engineered for accurate alignment within the engine block.The three-ring design features optimized thicknesses across the first, second, and third rings to improve cylinder sealing and reduce blow-by.This contributes to stable compression and reduced wear over extended.The 54mm connecting rod length maintains proper stroke geometry, supporting power delivery.Suitable for engine rebuilds and performance , this set integrates into compatible platforms, offering and consistent function under driving conditions.