Housing, Turbine, GTW3684R T3 Undivided .63 A/R, w/ T31 4 bolt (aka 2.5 4B) exit

This Garrett turbine housing is purpose-built for the GTW3684R turbocharger, giving performance builders and shop installers a direct-fit solution for their downpipe-side plumbing. Designed with an undivided T3 configuration, it’s the right choice for enthusiasts who need a proven, precision-matched housing without guesswork on exit flange compatibility. PT Turbo supplies this housing complete with its mating flange and gasket, streamlining the install process for serious builds.

Specifications

• Compatible Turbocharger: GTW3684R
• Housing Type: T3 Undivided
• A/R Ratio: .63
• Turbine Exit Flange: T31 Narrow 4 Bolt 2.5″ (down-pipe side)
• Also Known As: T31 4 bolt (aka 2.5″ 4B) exit
• Included Flange Product Code: ATP-FLS-084
• Included Gasket Product Code: ATP-GSK-012

Performance & Application

Built for the GTW3684R platform, this undivided T3 turbine housing is engineered to deliver the exhaust flow characteristics that serious builders demand from Garrett’s GTW Series. The undivided design keeps exhaust routing straightforward for single-turbo setups running standard T3 mounting, making it a strong fit for enthusiasts building high-performance street or race applications around the GTW3684R. Pairing this housing with its matched flange and gasket ensures a clean, direct-bolt installation on the downpipe side without sourcing separate hardware.

What’s Included

• Flange, “T