Boost Lab TD06SL2-20G Turbocharger for Subaru STI (450HP+)

Part Details:

The Boost Lab TD06SL2-20G Turbocharger for the Subaru STI is engineered as a high-performance OEM-style upgrade capable of supporting 450+ horsepower on pump fuel with proper supporting modifications and tuning. It is well suited for both aggressive street driving and track use, delivering strong top-end power while maintaining responsive spool characteristics for daily drivability.

This turbocharger features Boost Lab’s exclusive BL-R 6-blade 20G billet compressor wheel with extended exducer technology, designed to improve airflow efficiency and increase high-RPM performance. Paired with a proven TD06SL2 turbine wheel and 8cm² turbine housing, the result is a balanced powerband ideal for EJ25 and EJ20 turbocharged platforms.

Dual Ball Bearing Option

A dual ball bearing configuration is available as an upgrade option. Compared to the standard journal bearing model, the ball bearing version offers approximately 500 RPM faster spool and improved transient response. This option is available at an additional cost and can be selected from the product configuration menu.

Key Features

• Supports 450+ horsepower on pump gas with proper supporting modifications
• Boost Lab BL-R 6-blade 20G billet compressor wheel with extended exducer technology
• Performance TD06SL2 turbine wheel
• 8cm² turbine housing for balanced spool and top-end power
• Upgraded 360° thrust bearing for durability under high boost
• Optional dual ball bearing configuration for faster spool
• 1 Bar internal wastegate actuator included

What’s Included

• Boost Lab TD06SL2-20G Turbocharger
• 1 Bar internal wastegate actuator
• All required gaskets
• Downpipe studs and nuts

Fitment

Designed for 2004–2018 Subaru WRX STI EJ25 applications and 2004–2007 Subaru WRX EJ20 platforms. Fitment should be verified when using aftermarket exhaust manifolds or rotated setups.

Supporting Modifications

Upgrading to a turbocharger of this capacity requires proper supporting modifications including fuel system upgrades, intercooler improvements, and professional ECU calibration. Clutch and drivetrain upgrades may be necessary depending on power goals.

Frequently Asked Questions

Is tuning required?
Yes. Professional ECU tuning is required to safely operate this turbocharger and achieve intended performance levels.

What is the benefit of the dual ball bearing option?
The dual ball bearing configuration improves spool characteristics and transient boost response compared to the journal bearing version.

Can this reach 500+ horsepower?
While rated at 450+ horsepower on pump fuel, higher output levels may be achieved with race fuel or E85 and appropriate supporting modifications.

Recommended Supporting Forced Induction Components

• Intercooler Kits – help control intake temperatures and reduce heat soak at higher boost levels.
• Boost Controllers – improve boost targeting accuracy and consistency when upgrading turbochargers.
• Wastegates – regulate boost pressure and support stable turbo system operation under load.
• Turbo Inlets – support improved airflow to the turbocharger and reduce intake-side restriction.
• Turbo Bypass Valves – help manage excess boost pressure and maintain smooth drivability during throttle changes.
• Fuel Delivery Upgrades – commonly required to support higher airflow and maintain safe air-fuel ratios.
• EFI Tuning – tuning is required to calibrate boost control, fueling, and ignition after a turbo upgrade.
• Clutch Kits – increased torque often requires upgraded clutch capacity to prevent slip.
• COBB Tuning Performance Products – explore supporting tuning and turbo system components from COBB.
• Subaru WRX Performance Parts – browse supporting upgrades for WRX turbo builds.
• Subaru STI Performance Parts – explore turbo system and supporting components for STI applications.
• Subaru Forester XT Performance Parts – find forced induction upgrades for Forester XT builds.