VRSF Chargepipe Kit BMW X3 X4 35i M40i N55 F25 F26VRSF Chargepipe Kit BMW X3 X4 35i M40i N55 F25 F26 The OEM chargepipe on the N55 X3 and X4 is prone to failure at both stock and tuned boost levels. The VRSF Chargepipe Kit replaces it with a T6061 aluminium setup with precision CNC billet flanges at every connection point, 4 ply silicone couplers, and a wrinkle black powder coated finish. Sharper throttle response, less turbo lag, and no more boost leaks. ModsDirect supplies this kit to BMW