Very important – Only for Garrett turbo! 1.9 engines can have several turbo options. Please make sure your old core looks the same as in our advert pictures. Turbocharger Upgrade Cartridge VW Golf Jetta Passat Seat Seat Ibiza 1,9 TDI Turbo. + High Quality Mounting Kit (Market value 24 gbp). 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.