This is a Garrett T4 divided inlet turbine housing engineered specifically for the GT45R (GT/GTX4508R) turbocharger platform. Built for serious high-horsepower builds, it gives engine builders and tuners the flexibility to select the exact A/R ratio that matches their power and spool-up goals. Whether you’re targeting quick response or maximum top-end flow, this housing is the foundation for a properly matched GT45R turbine side.

Specifications

• Turbine Housing A/R: 1.01 a/r
• Turbine Housing A/R: 1.15 a/r
• Turbine Housing A/R: 1.28 a/r
• Turbine Housing A/R: 1.44 a/r
• Inlet Flange: T4 Divided Inlet
• Outlet: 4″ V-Band Discharge
• Garrett P/N (1.01 a/r): 757707-0005
• Garrett P/N (1.15 a/r): 757707-0006
• Garrett P/N (1.28 a/r): 757707-0007
• Garrett P/N (1.44 a/r): 757707-0008
• Also Known As: GT4508R, GTX4508R

Performance & Application

This turbine housing is designed for the GT45R and GTX4508R turbocharger family, giving builders a T4 divided inlet configuration paired with a large 4″ V-Band discharge for high-flow exhaust housing needs. The availability of four distinct A/R ratios allows this housing to be tailored to different power targets and turbo response characteristics, from quicker-spooling configurations to housings optimized for sustained top-end airflow. It’s built for engine platforms where the GT45R/GTX4508R turbocharger is already the chosen compressor side, and the builder needs to dial in turbine-side matching for their specific application.

Frequently Asked Questions

What A/R ratios are available for this housing?

This turbine housing is available in four A/R ratios: 1.01, 1.15, 1.28, and 1.44.

What inlet and outlet configuration does this housing use?

It features a T4 divided inlet flange and a 4″ V-Band discharge outlet.

What does GT45R or GTX4508R refer to?

GT45R and GTX4508R are aliases for the Garrett turbocharger platform this turbine housing is designed to fit.

Which Garrett part number corresponds to each A/R ratio?

The 1.01 a/r housing is P/N 757707-0005, the 1.15 a/r is P/N 757707-0006, the 1.28 a/r is P/N 757707-0007, and the 1.44 a/r is P/N 757707-0008.

For builders running the GT45R or GTX4508R platform, this T4 divided inlet housing delivers the exact turbine-side matching needed to unlock the full potential of the turbocharger across a wide range of power and response goals.