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Tomioka Racing

Tomioka Racing GTX2971 Ball-Bearing Twin Scroll Turbo Kit 2002-2007 Subaru WRX / 2004-2021 Subaru STI

Tomioka Racing GTX2971 Ball-Bearing Twin Scroll Turbo Kit 2002-2007 Subaru WRX / 2004-2021 Subaru STI

Regular price $3,100.00 USD
Regular price Sale price $3,100.00 USD
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Now available for the brand new GTX2971 Twin Scroll Turbo, the TR Equal Length Exhaust Manifold with Up-Pipe and TR Twin Scroll High Flow Catless Downpipe! The perfect combination for a complete twin scroll turbocharged setup for your WRX or STi. Rated up to ~430whp, the twin scroll technology ensures spool speed that is night and day in comparison to single scroll turbos. Thought your turbo spooled fast before? Think again.

This twin scroll edition features a ball-bearing cartridge, billet compressor wheel , and 10cm2 housing. Thanks to the billet compressor wheel the overall weight of the wheel is lighter than competing turbochargers and allows for maximum airflow throughout the unit with the help of point milling on each blade. A unique wheel and blade design, featuring a 20% larger wheel with 17% longer blades than the factory turbocharger. In addition, the GTX2971 features a port and polished exhaust housing to minimize exhaust flow turbulence. All hardware is included with purchase.

Catered to the die-hard Subaru fans! The twin scroll turbo is an efficient way to replace or upgrade your current twin scroll set up on your Subaru. With the rarity of twin-scroll turbo applications, we have created yet another direct bolt-on system, this time for the 2002-2007 WRX and 2004-2018 STi. The GTX2971 is already an efficient turbo but now paired with a complete twin-scroll system, spool time is dramatically decreased!

The Twin Scroll High Flow Catless Downpipe features larger diameter piping with ported flanges for a quicker and faster exhaust air flow compared to the standard OEM downpipe. Each downpipe is constructed of SUS304 grade stainless steel that gives it shine and durability that will last for years to come. Installation is a snap! The downpipe will fit like your OEM downpipe and comes with all the necessary hardware and gaskets.

The Twin Scroll Equal Length Headers feature a lost wax finish with 3-1 connectors and a smooth inner surface for the best air flow. A stable & effective connection s made by the slip joint bracket and air leakage is avoided by the 3 bolt flange design up-pipe.

All in all the entire system will bolt together without any issues and make way for quick installation, having all components sit in their stock locations in the engine bay.

Turbo Specifications:

Bearing Type:


Flange Type:

Standard Subaru 5-Bolts

Billet Compressor Wheel:

In: 54 mm

Ex: 72 mm

Turbine Wheel:

In: 60 mm

Ex: 57 mm

Turbine Housing:



1.3 bar / 19 psi


500 HP


Downpipe Specifications:


Stainless Steel SUS304

Pipe Thickness

0.25 Inch / 6.3mm

Flange Thickness

0.5 Inch / 12.5mm



2002 - 2007 Subaru WRX

2004 - 2018 Subaru STi

Kit Contents:

Turbocharger (TR-TS1047)


Upgraded Billet Actuator

Oil Drain Pipe

Water Pipe

Twin scroll Downpipe (TR-ES1005)

Down pipe to Exhaust Gasket x1 

Down pipe to Exhaust Nuts & Bolts x2

Exhaust Manifold (TR-ES1002)

Up Pipe (TR-ES1002)

50' x 2" Exhaust Wrap

*For Off-Road Use Only*

Off-Road Use Policy

By purchasing this product, you are acknowledging the use of this service is explicity for Competition/Off - Road Racing ONLY. It is the responsbility of the buyer to remain compliant with local, state & federal laws regarding EPA restrictions.

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