Housing, Turbine, GTW3684R, T3 Undivided .82 A/R, w/ T31 4 bolt (aka 2.5 4B) exit

This Garrett turbine housing is purpose-built for the GTW3684R turbocharger, designed for serious builders who demand a precise, bolt-on solution for their high-performance turbo system. Engineered for those who need reliable spool characteristics without sacrificing top-end capability, this housing delivers the exact fitment and flow characteristics Garrett intended for the GTW3684R platform.

Specifications

• Compatible Turbocharger: GTW3684R
• Housing Type: T3 Undivided
• A/R Ratio: .82
• Exit Flange: T31 4 Bolt (aka 2.5″ 4B)
• Included Flange: “T31″ Narrow 4 Bolt 2.5” (down-pipe side) — Product Code: ATP-FLS-084
• Included Gasket: “T31″ Narrow 4 Bolt 2.5” (down-pipe side) — Product Code: ATP-GSK-012

Performance & Application

This turbine housing is engineered for GTW3684R-equipped setups where responsive mid-range spool characteristics are the priority. The undivided T3 design and .82 A/R ratio work together to deliver a balance of quick spool with strong sustained performance, making this housing well-suited to high-performance applications built around the GTW3684R turbocharger. The T31 4 bolt exit ensures a clean, direct connection to the downpipe side of the exhaust system.

Frequently Asked Questions

What turbocharger is this housing designed for?

This turbine housing is designed specifically for the Garrett GTW3684R turbocharger.

What is the A/R ratio of this housing?

This turbine housing has a .82 A/R ratio.

What exit flange does this housing use?

This housing uses a T31 4 bolt exit, also known as a 2.5″ 4B exit, on the downpipe side.

Does this housing come with a flange and gasket?

Yes, the housing includes a “T31″ Narrow 4 Bolt 2.5” flange (Product Code: ATP-FLS-084) and a matching “T31″ Narrow 4 Bolt 2.5” gasket (Product Code: ATP-GSK-012) for the down-pipe side.

For builders running the GTW3684R and demanding precise, factory-matched turbine housing geometry, this .82 A/R T3 undivided housing with T31 4 bolt exit delivers the exact fitment and flow characteristics your build requires.