The Garrett GT4088 Journal Bearing Special is built for enthusiasts chasing serious horsepower without abandoning the proven simplicity of a journal bearing turbo. Designed as a direct, plug-and-play upgrade for older large frame T-series setups, this is the turbo of choice for builders who need big-frame durability paired with modern housing convenience. If your goal is a high-horsepower street or race build with straightforward downpipe compatibility, this is the turbo engineered for that job.
Specifications
- Compressor Wheel Inducer: 88mm
- Compressor Wheel Trim: 54 trim
- Turbine Wheel: 77mm
- Turbine Wheel Trim: 84 trim
- Turbine Housing A/R: .85, .95, or 1.06
- Bearing Type: Journal Bearing
- Compressor Inlet: 4″ slip-on with anti-surge ported shroud
- Compressor Outlet: 2.5″ slip-on
- Turbine Housing: ATP Special Exhaust housing, divided 1.06 T04 flange
- Turbine Housing Downpipe Flange: Standard 3″ V-Band machined into housing
- HP Capacity: 700+ HP
- Garrett P/N: 449739-5012
- Alternate P/N: 703457-5002S
- Alternate P/N: 449739-0034
Performance & Application
As the largest trim available in the GT40 family, the GT4088 Journal Bearing Special is purpose-built for high-output applications where a healthy 700+ HP setup is the target. The T4 housing’s multiple A/R options allow builders to tune the balance between spool characteristics and top-end power delivery to suit their specific combination. Its divided housing design and V-Band-equipped flange make it a seamless, plug-and-play replacement for older large frame T-series turbos, simplifying downpipe integration on serious builds. This is a turbo suited to enthusiasts building for maximum power rather than daily-driven low-end response.
Frequently Asked Questions
- What HP can the GT4088 Journal Bearing Special support?
- This turbo is capable of supporting a healthy 700+ HP setup, making it the largest trim available in the GT40 family.
- Is this a ball bearing or journal bearing turbo?
- The GT4088 Journal Bearing Special uses a journal bearing design.
- What turbine flange and downpipe fitment does this use?
- It features an ATP Special Exhaust housing with a divided 1.06 T04 flange, with a standard 3″ V-Band mach
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