Tomei Expreme Equal Length Exhaust Manifold - 2002-2014 WRX / 2004-2021 STi EJ20/EJ25

Maximize your Subaru's turbo performance with the Tomei Expreme Equal Length Exhaust Manifold. Engineered from premium SUS304 stainless steel with equal-length runners, this manifold dramatically improves exhaust flow, increases horsepower and torque, and delivers faster turbo spool. The ultimate upgrade for serious WRX and STi builds.

Key Features:

• Equal-length runner design for optimal exhaust flow and turbo efficiency
• SUS304 stainless steel construction for durability and heat resistance
• Mandrel-bent tubing maintains consistent diameter throughout
• Improved exhaust flow increases horsepower and torque
• Faster turbo spool for better throttle response
• Eliminates factory unequal-length manifold restrictions
• Direct bolt-on replacement for EJ20 and EJ25 engines
• Tomei quality engineering and manufacturing

Performance Benefits:

• Increased Power: Improved exhaust flow delivers measurable HP and torque gains
• Faster Turbo Spool: Equal-length design reduces lag for quicker boost response
• Better Exhaust Note: Equal-length eliminates Subaru rumble for smoother, more aggressive sound
• Improved Reliability: SUS304 stainless steel withstands extreme heat and prevents cracking
• Supports Higher Boost: Built to handle increased boost on modified engines
• Essential Upgrade: Foundation for any serious turbo build

Specifications:

• Brand: Tomei Powered
• Part Number: TB6010-SB02B
• Product: Expreme Equal Length Exhaust Manifold
• Material: SUS304 stainless steel
• Design: Equal-length runners
• Tubing: Mandrel-bent
• Finish: Polished stainless steel
• Installation: Direct bolt-on replacement
• Weight: Lighter than factory cast iron manifold

Fitment Information:

• Compatible Vehicles:
• 2002-2007 Subaru Impreza WRX (EJ20/EJ25)
• 2008-2014 Subaru Impreza WRX (EJ25)
• 2004-2021 Subaru Impreza WRX STi (EJ25)
• 2004-2008 Subaru Forester XT (EJ25)
• Engines: EJ20 and EJ25 turbocharged engines
• Note: Designed for top-mount turbo configurations. Verify fitment for your specific model year and turbo setup.

What's Included:

• Tomei Expreme equal length exhaust manifold
• Gaskets and hardware
• Installation instructions

Installation Notes:

• Professional installation strongly recommended
• Requires removal of factory exhaust manifold and turbo
• Installation time: approximately 4-6 hours
• New turbo gaskets and hardware recommended
• ECU tuning required to optimize performance gains
• May require up-pipe and downpipe upgrades for best results

Equal-Length Design - The Game Changer:

The factory Subaru exhaust manifold uses an unequal-length design where exhaust runners are different lengths. While this creates the iconic Subaru rumble, it also creates exhaust pulse interference that reduces turbo efficiency and power. The Tomei equal-length manifold features runners of identical length, ensuring exhaust pulses reach the turbo evenly and efficiently. This eliminates interference, improves scavenging, and delivers faster turbo spool and increased power.

SUS304 Stainless Steel Construction:

Tomei uses premium SUS304 stainless steel for exceptional durability and heat resistance. Unlike the factory cast iron manifold that can crack under high heat and stress, the Tomei stainless steel manifold withstands extreme temperatures and increased boost levels without failure. The material is also significantly lighter than cast iron, reducing weight on the engine.

Mandrel-Bent Tubing:

All tubing is mandrel-bent to maintain consistent internal diameter throughout each bend. This eliminates the crimping and restriction that occurs with crush bending, ensuring smooth, unrestricted exhaust flow. The result is maximum flow efficiency and power gains.

Performance Gains:

The Tomei equal-length manifold delivers measurable performance improvements:

• Horsepower: Gains of 10-20+ HP depending on supporting modifications
• Torque: Improved torque across the entire RPM range
• Turbo Spool: Noticeably faster boost response and reduced lag
• Top End: Better flow supports higher RPM power

Note: Actual gains vary based on engine condition, supporting modifications, and tuning.

The Sound Change:

Installing an equal-length manifold eliminates the iconic Subaru rumble and replaces it with a smoother, more aggressive exhaust note similar to other turbocharged 4-cylinder engines. This is a result of the equal-length design creating even exhaust pulses. Some enthusiasts prefer this sound, while others prefer to keep the rumble. Consider this before purchasing.

ECU Tuning Required:

IMPORTANT: The Tomei manifold requires ECU tuning to optimize performance and ensure safe operation. The improved exhaust flow changes the engine's air/fuel characteristics, and tuning is essential to prevent running lean or experiencing knock. Professional dyno tuning is strongly recommended.

Supporting Modifications:

For maximum performance, pair the Tomei manifold with:

• Aftermarket turbo or turbo upgrade
• High-flow up-pipe (catless or high-flow cat)
• High-flow downpipe (catless or high-flow cat)
• Cat-back exhaust system
• Cold air intake
• ECU tuning (essential)

Why Tomei?

Tomei Powered has been engineering high-performance engine components for over 50 years, with deep roots in Japanese motorsport. Their exhaust manifolds are proven on race tracks and dyno sheets worldwide, delivering consistent, reliable performance gains. Every Tomei product is engineered with precision and manufactured to the highest quality standards.

Installation Tips:

• Use new gaskets and hardware for proper sealing
• Apply anti-seize to all bolts to prevent seizing
• Torque all fasteners to factory specifications
• Check for exhaust leaks after installation
• Get professional ECU tuning after installation
• Consider installing up-pipe and downpipe at the same time

Perfect For:

• WRX and STi owners seeking maximum turbo performance
• Turbo upgrade builds requiring better exhaust flow
• Track cars and race builds
• Anyone wanting faster turbo spool and increased power
• Builds targeting 400+ HP

Perfect For: Serious WRX and STi enthusiasts looking to maximize turbo performance with proven, race-tested engineering.

Pro Tip: Install the Tomei manifold as part of a complete turbo upgrade package (turbo, up-pipe, downpipe, tune) for maximum performance gains.

Race-Proven: Tomei Powered - over 50 years of motorsport engineering excellence.

Maximize your Subaru's turbo performance with Tomei Expreme equal-length manifold - SUS304 stainless, improved flow, faster spool, race-proven quality.