Cartridge Small side for BMW X1 X5 525 425 125 225 325 160kw 7823256 + Gaskets. Upgrade Stage 1. This core has Top quality, aftermarket compressor wheel manufactured from solid (MFS) billet alloy via precision 5 axis CNC machine. The cold side wheel is the same size as original turbo but it is lighter and stronger wheel. It helps turbo spool up little bit faster. To get any power increase car needs to be Chip Tuned. If you car has 160 kw engine – this turbo 100% will be the right one.