Turbocharger Cartridge Audi A1 / Seat Ibiza / VW Polo / Skoda Fabia 1.4 TDI. Engine has several turbo options. Please make sure your old core looks 100% the same as in our advert pictures.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.