T4 twinscroll - 1.45 A/R - 74mm turbine wheel BorgWarner EFR 74mm turbine housing - 12741008003 T4 twinscroll - 1.45 A/R - 74mm turbine wheel Genuine BorgWarner EFR turbine housing You receive a single genuine turbine housing for a BorgWarner EFR turbocharger, this let you choose which A/R ratio orientation of the flange and flange type fits best to your application. Fits the subsequent turbochargers: BorgWarner EFR-8374 / EFR-8474 / EFR-9174 / EFR-9274 For turbine wheels: 74mm A/R ratio: 1.45 Turbine flange: T4 divided / Twin Scroll Different A/R ratio? With this turbine housing you can fit your EFR turbocharger with a different A/R ratio. If you purchase an EFR turbocharger and wish to have a different A/R turbine housing, you have to order the corresponding turbine housing in addition. Notice: Mounting kit for turbine housing is sold separately!