Borg Warner S300SX3-66 S366 .91 A/R T4 Turbocharger (90 Compressor Outlet) BorgWarner Airwerks S300SX3-66, S366, S300 91/79 with .91 A/R Twin Scroll Turbine Housing. Rated at 500 to 830 HP This is the largest of the S300SX3 midframe turbochargers from BorgWarner Airwerks line. Wheel Dimensions: Compressor: 66 mm inducer / 91.4mm exducer, with exclusive Extended Tip Technology. Turbine: 80 mm inducer / 73 mm exducer. Cast in Inconel 713 for high-temperature operation. Housings: Compressor: Large 4.00 ported anti-surge air inlet / 3.00 charge pipe outlet Turbine: .91 A/R Twin Scroll, with ‘T4-style’, divided entry, and 4.21 v-band discharge.