Housing, Turbine, GTW3884R, T3 Undivided .82 A/R, w/ T31 4 bolt (aka 2.5 4B) exit

This Garrett GTW3884R turbine housing delivers a T3 undivided .82 A/R configuration with a T31 narrow 4-bolt exit, purpose-built for enthusiasts running the GTW3884R turbocharger who need a complete, bolt-on downpipe solution. Designed for serious builds where exhaust housing selection directly shapes spool characteristics and top-end flow, this housing is matched precisely to the GTW3884R turbine wheel for correct fitment. It’s the right choice for anyone assembling or upgrading a GTW3884R-based turbo system who wants OEM-correct Garrett hardware without guesswork on flange compatibility.

Specifications

• Compatible Turbocharger: GTW3884R
• Turbine Housing Entry: T3 Undivided
• A/R Ratio: .82
• Exit Flange: T31 4 Bolt (aka 2.5″ 4B)

Performance & Application

This turbine housing is engineered specifically for the GTW3884R turbocharger, making it a direct fit for builds already running or planning to run that turbo. The T3 undivided .82 A/R design pairs with the T31 narrow 4-bolt exit to route exhaust flow into a 2.5″ downpipe configuration. Because the housing is matched to the GTW3884R’s turbine wheel, it maintains the intended balance of spool response and flow characteristics for this specific turbocharger. This makes it a straightforward, correct-fit option for anyone building or servicing a GTW3884R turbo system.

Compatibility & Fitment

• Designed for use with Garrett GTW3884R turbochargers
• T31 narrow 4-bolt 2.5″ exit for downpipe-side connection

What’s Included

• Turbine housing (GTW3884R, T3 undivided .82 A/R, T31 4 bolt exit)
• Flange, “T31″ Narrow 4 Bolt 2.5” (down-pipe side) (Product Code: ATP-FLS-084)
• Gasket, “T31″ Narrow 4 Bolt 2.5” (down-pipe side) (Product Code: ATP-GSK-012)

Frequently Asked Questions

What is the A/R ratio of this turbine housing?

This turbine housing has a .82 A/R ratio in a T3 undivided configuration.

What turbocharger is this turbine housing designed for?

This turbine housing is designed for the Garrett GTW3884R turbocharger.

What does “T31 4 bolt” refer to?

T31 4 bolt is also known as the 2.5″ 4B exit, referring to the narrow 4-bolt downpipe-side flange configuration.

Does this turbine housing come with a matching flange and gasket?

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

For GTW3884R-based builds, this housing delivers the exact Garrett-specified .82 A/R T3 undivided configuration with a complete T31 4-bolt exit setup, giving you a correct, bolt-on path to downpipe integration.