Alternate, Large T04S, Compressor housing for GT3071R/GT2871R 71mm 56 trim – .70 A/R 4″ in /2.5″ out

This is a large-frame T04S compressor housing purpose-built for GT3071R and GT2871R turbochargers, designed for enthusiasts and builders looking to maximize airflow efficiency on their ball bearing Garrett setup. It’s the right choice for anyone running a 71mm 56 trim compressor wheel who needs a housing sized and shaped to unlock the wheel’s full potential. Precision-matched to the wheel geometry, this housing is built for serious performance applications where flow and fitment accuracy matter. Specifications Compressor Wheel Size: 71mm Compressor Wheel Trim: 56 A/R Ratio: .70 Housing Style: T04S Inlet Size: 4″ Outlet Size: 2.5″ Performance & Application Engineered around the 71mm 56 trim compressor wheel found in the GT3071R and GT2871R platforms, this housing is built for builders who want to fully capitalize on their turbo’s flow characteristics. The .70 A/R ratio and T04S housing geometry are matched to deliver efficient airflow through the 4″ inlet and 2.5″ outlet, supporting strong performance across the compressor map. This housing is also available in an anti-surge ported shroud configuration for applications demanding extended surge resistance, and can be finished in a mirror polish for builders who want a premium appearance to match premium performance. It’s a solid choice for enthusiasts upgrading or rebuilding a GT3071R or GT2871R-based turbo system. Compatibility & Fitment GT3071R turbocharger (71mm 56 trim compressor wheel) GT2871R turbocharger (71mm 56 trim compressor wheel) Frequently Asked Questions What compressor wheel does this housing fit? This housing is designed for the 71mm 56 trim compressor wheel used in GT3071R and GT2871R turbochargers. What is the A/R ratio of this housing? The A/R ratio is .70. What inlet and outlet sizes does this housing use? This housing features a 4″ inlet and a 2.5″ outlet. What else do I need to install this housing? This housing should be used with the T04S frame backplate adapter and clamps for proper installation. For builders running a GT3071R or GT2871R with the 71mm 56 trim compressor wheel, this T04S housing delivers the precise fitment and airflow geometry needed to get the most out of the platform.