GARRETT G42-1200 73MM with T4 Divided 1.15 A/R Hotside
Horsepower: 475 - 1200
Displacement: 2.0L - 7.0L
Features
GARRETT G SERIES COMPRESSOR AERODYNAMICS FOR MAXIMUM HORSEPOWER
73mm COMPRESSOR INDUCER | 91MM COMPRESSOR EXDUCER
82MM TURBINE INDUCER | 75MM TURBINE EXDUCER
FULLY MACHINED SPEED SENSOR AND PRESSURE PORTS
NEW TURBINE WHEEL AERO FOR INCREASED EFFICIENCY AND FLOW
STAINLESS STEEL TURBINE HOUSINGS IN T4 AND V-BAND CONNECTIONS
WATER FITTINGS INCLUDED
CFD (computational fluid dynamics) engineered compressor wheel
Optimized blade contour with 10 blade count
Forged and fully-machined compressor wheel
More power and faster boost response
Smaller wheel = lower inertia
he turbine wheel features all new aerodynamics to improve flow and boost response.
Inconel super alloy construction for temperatures up to 950C
New turbine wheel flows 10% more and has peak efficiency of 77% 
82mm inducer / 75mm exducer 84 Trim
G42 turbine housings are made from stainless steel to provide ultimate durability and temperature capability up 950 deg C degrees | 1742 deg F
Part numbers 860778-5004S (supercore) & 757707-0015 (turbine housing)