Housing, Turbine, GTW3684R, T3 Undivided, .63 A/R, w/ T31 V-band

This GTW3684R turbine housing is built for Garrett GTW-series turbocharger owners who demand precise exhaust housing sizing and a clean, leak-free exit connection. Designed as a T3 undivided housing, it’s the right choice for enthusiasts and shops running compatible GTW turbo builds who need a proven flange and clamping solution without guesswork. Its component-matched design ensures a secure, repeatable fitment for serious performance applications.

Specifications

• Housing Type: T3 Undivided
• A/R Ratio: .63
• Exit Flange: T31 (narrow) V-Band
• Exit Flange OD: 3.10″
• Flange Design: Double stepped flange, 2.5″ / T31 V-Band
• Garrett P/N: GTW3684R

Performance & Application

This turbine housing is engineered for compatible Garrett GTW turbo applications where a T3 undivided inlet configuration and T31 narrow V-band exit are required. The .63 A/R ratio defines the exhaust-side flow characteristics for the specific power delivery and spool behavior this housing is matched to. Its double-stepped flange design supports a secure connection between the housing and downstream exhaust components, making it well suited for performance builds that demand a reliable, engineered fit.

What’s Included

• Double stepped flange, 2.5″ / T31 V-Band
• STAINLESS V-Band Clamp – 2.5″ / T31 for 3.10″ OD Flanges

Frequently Asked Questions

What is the A/R ratio of the GTW3684R turbine housing?

The GTW3684R turbine housing has a .63 A/R ratio.

What type of exit flange does this housing use?

It uses a T31 (narrow) V-band exit with a 3.10″ OD.

Is this a divided or undivided turbine housing?

This is a T3 undivided turbine housing.

Does this housing come with a clamp?

Yes, it includes a stainless V-band clamp sized 2.5″ / T31 for 3.10″ OD flanges.

For builders standardizing on Garrett’s GTW platform, the GTW3684R delivers the exact T3 undivided, .63 A/R, T31 V-band configuration needed for a dependable, engineered exhaust-side fitment.