Holset Super HX40 - Competition (Supercore) This is an upgraded Super HX40 with billet compressor wheel. It provides more power, better spool and wider power band with increased durability. Wide power band with brutal power up to approximately 750hp. -Billet compressor wheel, Compressor 60 / 86mm. -Turbine 75/65 mm. -Turbine  housing options 14-16 cm², T3 (Twin entry) Below you can see a picture of the compressor wheel that comes with this turbo. It can't be compared to standard forged wheels found in many turbos, as this one is developed for racing and maximum performance.