This BorgWarner EFR B1 58mm turbine housing features a .80 a/r T4 flange in a twin-scroll configuration. Intended for use with compatible EFR turbo components, the twin-scroll housing separates exhaust pulses to improve turbine efficiency and spool characteristics for engines set up for that flange and scroll pairing. Install it when matching spool and flange requirements in an EFR B1 turbo build.

BorgWarner Turbine Housing EFR B1 58mm .80 T4 flange Twin Scroll WG G