ATP Turbine Housing, G25-550/660, .61 A/R, Open T3 Inlet, 3″ GT VB Outlet

This ATP turbine housing is purpose-built for tuners and builders running Garrett’s G25-550 or G25-660 turbochargers who need a precision-matched, standard rotation housing without compromise. Designed around an open T3 inlet and a modern V-band outlet, it delivers the flow characteristics serious performance applications demand. If you’re finalizing a G-series turbo system and need a housing engineered for clean bolt-on integration, this is the correct component for the job.

Specifications

• Turbine Inlet Type: T3 Inlet, undivided (open)
• Turbine Outlet Type: 3″ GT V-band outlet
• Outlet Outer Diameter: 90mm OD
• Centering Ring Diameter: 81mm
• A/R Ratio: .61
• Rotation: Standard rotation
• Compatible Turbo Models: G25-550, G25-660

Performance & Application

This housing is engineered specifically for the Garrett G25-550 and G25-660 standard rotation turbochargers, making it a direct fit for builders working within the G-series platform. The open, undivided T3 inlet design and .61 A/R ratio are configured for precise flow management on these specific turbo models. Its 3″ GT V-band outlet supports clean, modern downpipe integration for installers prioritizing fitment accuracy. This housing is best suited to enthusiasts and shops building complete G25-series turbo systems who require exact compatibility rather than universal fitment.

Compatibility & Fitment

• Garrett G25-550 turbocharger (standard rotation)
• Garrett G25-660 turbocharger (standard rotation)

Frequently Asked Questions

What A/R ratio does this turbine housing use?

This turbine housing is built with a .61 A/R ratio.

What type of turbine inlet does this housing have?

It features a T3 inlet that is undivided, or “open,” in design.

What outlet configuration does this housing use?

It uses a 3″ GT V-band outlet with a 90mm OD and an 81mm centering ring.

Which Garrett turbochargers is this housing compatible with?

This housing is designed for the standard rotation Garrett G25-550 and G25-660 G-series turbochargers.

For builders running a standard rotation G25-550 or G25-660, this turbine housing delivers the exact inlet, outlet, and A/R configuration needed for a precise, high-performance install.