Subaru EJ207 Version 8 STI Swap Package with VF37 Twin-Scroll Turbo

Build your WRX around one of Subaru’s most desirable JDM STI powerplants. This EJ207 Version 8 swap package combines the 2.0L turbocharged STI engine with an IHI VF37 twin-scroll turbo, JDM ECU, engine harness and STI top-mount intercooler.

Instead of sourcing the major JDM components separately, this package provides an excellent starting point for a properly planned EJ205-to-EJ207 conversion.

J-Spec Auto Sports has compression tested this specific engine, and the actual testing video is available for review.

Engine & Package Details

• Engine: Subaru EJ207 Version 8 STI
• Displacement: 2.0L
• Configuration: Turbocharged flat-four boxer
• Cylinder Heads: DOHC
• Valve Timing: AVCS
• Turbo: IHI VF37 twin scroll
• Intercooler: STI top-mount intercooler
• ECU: JDM ECU included
• Harness: Engine wiring harness included
• Serial Number: EJ207 B729657
• Condition: Used JDM
• Testing: Compression tested
• Test Video: Available
• Warranty: 30-day limited warranty
• Origin: Japan

More Than an EJ207 Long Block

This package offers considerably more than a bare replacement engine.

You receive the major components shown with the engine, including:

• EJ207 Version 8 engine
• VF37 twin-scroll turbocharger
• JDM ECU
• Engine wiring harness
• STI top-mount intercooler
• Attached components shown in the photos

Having these components together makes this package particularly attractive for a properly planned EJ205-to-EJ207 conversion.

VF37 Twin-Scroll Turbo System

The included IHI VF37 uses Subaru’s twin-scroll exhaust configuration.

Twin-scroll systems separate exhaust pulses before they reach the turbine. When paired with the correct exhaust components, this design helps improve turbo response and gives the Version 8 STI its distinctive power delivery.

However, converting a single-scroll WRX requires the correct supporting hardware.

Depending on your existing setup, you may need:

• Twin-scroll exhaust manifold
• Compatible up-pipe
• Twin-scroll downpipe
• Correct turbo oil and coolant lines
• Appropriate boost-control components
• Compatible exhaust hardware

Plan the entire turbo and exhaust configuration before installing the engine.

EJ205 to EJ207 Conversion

This Version 8 EJ207 is a popular upgrade path for compatible 2002–2005 Subaru Impreza WRX models originally equipped with the EJ205.

However, an EJ207 conversion involves more than physically installing the engine.

The installer must properly address:

• AVCS operation
• ECU integration
• Engine wiring
• Vehicle-side wiring
• Sensors
• Fuel delivery
• Boost control
• Twin-scroll exhaust configuration
• Cooling system
• Engine management

For that reason, we recommend installation by a technician experienced with Subaru EJ-series swaps.

AVCS, ECU & Harness

The Version 8 EJ207 uses Subaru’s Active Valve Control System (AVCS).

The original USDM EJ205 setup does not control the JDM EJ207 exactly the same way. Therefore, the conversion requires the appropriate wiring and engine-management strategy.

This package includes both the JDM ECU and engine harness, giving your installer important components for completing the conversion.

Do not assume that simply connecting the supplied ECU will make every USDM vehicle plug-and-play. Verify the complete wiring configuration before installation.

Compression Tested Before Sale

J-Spec Auto Sports compression tested this specific EJ207 before offering it for sale.

An actual compression-test video is available so you can review testing associated with the engine you are purchasing.

Engine Serial: EJ207 B729657

Compare the serial number with the product photographs and testing information before purchase.

Recommended Pre-Installation Service

Before installing a used JDM turbo engine, inspect and service accessible maintenance components.

We recommend checking or replacing as needed:

• Timing belt
• Timing belt tensioner
• Idler pulleys
• Water pump
• Camshaft seals
• Front crankshaft seal
• Rear main seal
• Valve cover gaskets
• Spark plugs
• Engine oil and filter
• Coolant hoses
• Accessory belts

Also inspect the turbocharger’s oil and coolant supply system.

Important First-Startup Procedure

Before initial startup, prime the engine lubrication system to establish oil pressure before allowing the engine to run normally.

The turbocharger also depends on proper oil supply. Therefore, confirm oil circulation and turbo oil-feed integrity before startup.

After installation, fill the cooling system with the correct coolant and thoroughly bleed the Subaru cooling system.

Monitor oil pressure, coolant temperature, fluid levels and leaks carefully during the first startup and heat cycles.

Nationwide Shipping

J-Spec Auto Sports ships JDM engines throughout the continental United States.

Engines are prepared and secured for freight transportation. Commercial delivery locations with a forklift or loading dock are preferred when available.

Contact us for current freight options and delivery pricing.

Professional EJ207 Installation

Professional installation is available at J-Spec Auto Sports in Richmond, Virginia.

An EJ207 twin-scroll conversion requires more planning than a standard engine replacement. Our team can assist with installation, AVCS considerations, engine configuration and supporting components.

Contact us for current installation pricing.

30-Day Limited Warranty

This EJ207 includes a 30-day limited warranty, subject to J-Spec Auto Sports’ current warranty terms and installation requirements.

Review the complete warranty policy before installation.

Frequently Asked Questions

What is included with this EJ207 package?
The package includes the EJ207 Version 8 engine, VF37 twin-scroll turbo, JDM ECU, engine harness and STI top-mount intercooler shown in the listing.

Is this a genuine JDM STI engine?
Yes. This is a Japanese-market Subaru EJ207 Version 8 STI engine imported from Japan.

Is the VF37 twin scroll?
Yes. The IHI VF37 included with this package uses a twin-scroll configuration.

Can this replace my EJ205?
It can be used as an upgrade for compatible 2002–2005 WRX EJ205 applications when properly configured.

Is this a plug-and-play EJ205 replacement?
No. AVCS wiring, ECU integration, twin-scroll exhaust components and other supporting systems must be properly configured.

Does the ECU come with it?
Yes. A JDM ECU is included.

Is the engine harness included?
Yes. The engine wiring harness is included.

Does it include the STI intercooler?
Yes. The top-mount intercooler shown with the engine is included.

Has this engine been compression tested?
Yes. J-Spec Auto Sports compression tested this engine, and an actual test video is available.

What is the engine serial number?
EJ207 B729657.

Should I replace the timing belt before installation?
When service history cannot be confirmed, inspect or replace the timing belt, tensioner, idlers, water pump and accessible seals while the engine is out of the vehicle.

Do I need a twin-scroll downpipe?
A VF37 twin-scroll conversion requires compatible twin-scroll exhaust components. Verify your header, up-pipe, downpipe and complete exhaust configuration before installation.

Does J-Spec ship nationwide?
Yes. Freight shipping is available throughout the continental United States.

Can J-Spec install this engine?
Yes. Professional EJ207 installation is available at J-Spec Auto Sports in Richmond, Virginia.

Buy more EJ207 engines:  https://jspecauto.com/product-category/engines/?_product_brand=subaru&_engine_sub_category=jdm-ej207-ej20y-engines-for-subaru-wrx-motors&_available=1