T4 Divided (twinscroll) Turbine housing for all GT42 and GTX42

This T4 divided twinscroll turbine housing is purpose-built for GT42 and GTX42 series turbochargers, designed for serious builders who demand precise exhaust pulse separation and reliable high-boost performance. Offered across four distinct A/R ratios, it allows tuners to dial in the exact balance of response and top-end airflow their build requires. This is the housing of choice for anyone running a GT42/GTX42 platform who refuses to compromise on turbine-side engineering.

Specifications

• Housing Type: T4 Divided (Twinscroll) Turbine Housing
• Turbine Inlet Flange: T4 divided inlet
• Downpipe Outlet: 4″ V-band exit
• A/R Ratio Option 1: 1.01 A/R (Garrett P/N 757707-0001)
• A/R Ratio Option 2: 1.15 A/R (Garrett P/N 757707-0002)
• A/R Ratio Option 3: 1.28 A/R (Garrett P/N 757707-0003)
• A/R Ratio Option 4: 1.44 A/R (Garrett P/N 757707-0004)
• Garrett P/N: 757707-0001 / 757707-0002 / 757707-0003 / 757707-0004

Performance & Application

Engineered specifically for GT4294, GT4202, GT4294R, GT420R, GTX4294R, and GTX4202R turbochargers, this housing is also configurable for use on the GT4508R and GTX4508R via a selectable build option. The divided twinscroll design keeps exhaust pulses separated through the turbine, preserving energy for improved response while supporting the demands of large-frame GT42/GTX42 turbo applications. With four A/R ratio choices ranging from tighter 1.01 up through larger 1.44, builders can tailor turbine sizing to prioritize either quicker spool characteristics or maximized top-end flow depending on the specific power goals of the build.

Compatibility & Fitment

• GT4294 / GT4202
• GT4294R
• GT420R
• GTX4294R
• GTX4202R
• Optional configuration available for GT4508R
• Optional configuration available for GTX4508R

Frequently Asked Questions

What A/R ratios are available for this turbine housing?

This housing is available in 1.01, 1.15, 1.28, and 1.44 A/R ratios, corresponding to Garrett P/Ns 757707-0001 through 757707-0004.

What turbine inlet flange and downpipe exit does this housing use?

It features a T4 divided (twinscroll) inlet flange with a 4″ V-band downpipe exit.

What turbochargers is this housing compatible with?

It is designed for GT4294, GT4202, GT4294R, GT420R, GTX4294R, and GTX4202R turbochargers.

Can this housing be used on a GT4508R or GTX4508R?

Yes, there is a selectable option to configure this housing for use on the GT4508R/GTX4508R.

For builders running the GT42/GTX42 platform who need precise, application-matched turbine housing options, this T4 divided twinscroll housing delivers the exact A/R and flange configuration required to get the build right the first time.