The Garrett GT4508R is a purpose-built, high-output turbocharger engineered for enthusiasts chasing serious top-end power without sacrificing a compact, engine-bay-friendly footprint. Built around a compact 42 frame with a divided T4 turbine housing, this unit is designed for builders who need massive airflow potential in a package that still fits demanding installations. It’s the choice for those building toward four-digit horsepower goals on a high-boost, high-response platform.

Specifications

• Compressor Wheel Exducer: 108.0mm
• Compressor Wheel Inducer: 79.8mm
• Compressor Wheel Trim: 55 trim
• Turbine Wheel: 87.0mm
• Turbine Wheel Trim: 85 trim
• Turbine Housing A/R: 1.15 Divided T4
• Frame/Footprint: Compact 42
• HP Capacity: Approximately 1200 HP
• Garrett P/N: Pending

Performance & Application

Rated to support approximately 1200 horsepower, the GT4508R is built for high-horsepower forced induction builds where sustained top-end power delivery is the priority. The divided T4 turbine housing helps maintain exhaust pulse separation for improved turbine response in high-output applications, while the compact 42 footprint allows this large-capacity turbo to be packaged more efficiently than traditional GT42-class housings. This is a turbocharger for builders targeting serious peak power numbers rather than low-end responsiveness.

Frequently Asked Questions

How much horsepower can the GT4508R support?

The GT4508R is capable of approximately 1200 HP.

What compressor wheel does the GT4508R use?

It uses a 108.0mm exducer / 79.8mm inducer compressor wheel with a 55 trim.

What turbine wheel and A/R ratio does this turbo use?

The GT4508R uses an 87.0mm turbine wheel with an 85 trim, paired with a 1.15 A/R divided T4 turbine housing.

What does “Compact 42” refer to?

The GT4508R is built on a compact 42 footprint, offering a more space-efficient packaging compared to standard GT42-class turbochargers.

For builders demanding serious top-end horsepower in a footprint that doesn’t force major engine bay compromises, the Garrett GT4508R delivers the flow capacity and turbine response to get there.