Tomei Straight Race Downpipe - 2008-2014 Subaru WRX STi

Maximize your STi's performance with the Tomei Straight Race Downpipe. Featuring full 3-inch catless construction with mandrel-bent SUS304 stainless steel, this downpipe delivers massive gains of +25 HP and +30 lb-ft torque. Maximum exhaust flow, aggressive sound, and race-proven Tomei quality make this the ultimate downpipe upgrade for serious STi builds.

Key Features:

• Full 3-inch catless design for maximum exhaust flow
• Mandrel-bent SUS304 stainless steel construction
• Proven power gains: +25 HP / +30 lb-ft torque
• Straight-through design eliminates all restrictions
• Aggressive, race-inspired exhaust tone
• Direct bolt-on replacement - no modifications required
• Includes all necessary gaskets and hardware
• Tomei quality engineering and manufacturing

Performance Benefits:

• Massive Power Gains: +25 HP and +30 lb-ft torque (dyno-tested)
• Maximum Exhaust Flow: Catless design eliminates all restrictions
• Aggressive Sound: Race-inspired tone showcases the EJ257 engine
• Essential for Stage 2+: Required for Stage 2 and higher tuning
• Supports High Boost: Built to handle increased boost on modified engines
• Race-Proven: Tomei quality tested on track and dyno

Specifications:

• Brand: Tomei Powered
• Part Number: TB6060-SB02B
• Product: Straight Race Downpipe
• Piping Diameter: 3 inches (76mm)
• Material: SUS304 stainless steel
• Construction: Mandrel-bent
• Catalytic Converter: Catless (off-road use only)
• Power Gains: +25 HP / +30 lb-ft torque
• Installation: Direct bolt-on replacement
• Weight: 15.4 lbs

Fitment Information:

• Compatible Vehicles:
• 2008-2014 Subaru Impreza WRX STi (sedan)
• Engine: 2.5L EJ257 turbocharged
• Note: Catless design - for off-road use only. Not legal for street use in emissions-regulated areas.

What's Included:

• Tomei straight race downpipe (complete)
• Gaskets and hardware
• Installation instructions

Installation Notes:

• Professional installation strongly recommended
• Direct bolt-on replacement - no cutting or welding required
• Installation time: approximately 2-3 hours
• Lift or jack stands required
• ECU tuning REQUIRED after installation
• Check engine light will illuminate without tune

Full 3-Inch Catless Design:

The Tomei Straight Race Downpipe features full 3-inch (76mm) catless construction for maximum exhaust flow. By eliminating the restrictive factory catalytic converter, the downpipe dramatically reduces backpressure and allows the EJ257 turbo engine to breathe freely. This results in massive power gains, improved turbo spool, and enhanced throttle response.

Mandrel-Bent SUS304 Stainless Steel:

All piping is mandrel-bent to maintain consistent internal diameter throughout each bend, eliminating the crimping and restriction that occurs with crush bending. The SUS304 stainless steel construction provides exceptional durability, corrosion resistance, and heat tolerance. This premium material ensures the downpipe maintains its appearance and performance even after years of use.

Massive Power Gains:

Dyno testing shows the Tomei Straight Race Downpipe delivers +25 HP and +30 lb-ft torque on a stock STi when combined with proper ECU tuning. These gains come from the dramatically improved exhaust flow and reduced backpressure. When combined with other modifications (intake, exhaust, intercooler), the gains are even more significant as the downpipe supports higher power levels.

Essential for Stage 2+ Tuning:

The Tomei downpipe is essential for Stage 2 and higher tuning on the STi. Stage 2 tuning requires a high-flow or catless downpipe to support the increased boost and fuel delivery. Without a proper downpipe, you'll be leaving significant power on the table and potentially running into boost control issues.

Aggressive Race Sound:

The catless design delivers an aggressive, race-inspired exhaust tone that showcases the EJ257's turbo character. The sound is loud and exciting during acceleration, with enhanced turbo spool and wastegate noise. This is a true race exhaust note that turns heads and announces your STi's performance.

ECU Tuning REQUIRED:

IMPORTANT: Installing a catless downpipe requires ECU tuning to adjust the fuel maps and remove the check engine light. Running a catless downpipe without proper tuning will result in a check engine light and potentially unsafe air/fuel ratios. Professional dyno tuning with an Accessport or standalone ECU is strongly recommended.

Off-Road Use Only:

IMPORTANT: This is a catless downpipe designed for off-road use only. It is not legal for street use in areas with emissions regulations. Installing a catless downpipe will cause your vehicle to fail emissions testing. Check your local laws before purchasing.

Why Tomei?

Tomei Powered has been engineering high-performance Subaru parts for over 50 years, with deep roots in Japanese motorsport. Their downpipes 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.

Sound Level:

The Tomei Straight Race Downpipe delivers an aggressive exhaust note:

• Idle: Deep, aggressive turbo rumble
• Cruising: Noticeable exhaust tone, turbo spool audible
• Acceleration: Very loud, aggressive exhaust note with turbo spool
• WOT: Extremely loud - true race sound

Perfect Pairing:

For maximum performance, pair the Tomei downpipe with:

• Cold air intake for improved airflow
• Cat-back exhaust for complete exhaust system
• Upgraded intercooler for lower intake temps
• ECU tuning (Accessport) to optimize for modifications

Installation Tips:

• Allow factory downpipe to cool completely before removal
• Use penetrating oil on factory bolts if rusted
• Support downpipe during removal to prevent damage
• Install new gaskets for proper sealing
• Tighten all hardware to proper torque specifications
• Check for exhaust leaks after installation
• Get ECU tuning immediately after installation

Perfect For:

• 2008-2014 STi owners seeking maximum power gains
• Stage 2+ builds requiring high-flow downpipe
• Track cars and race applications (off-road use)
• Anyone wanting aggressive race sound
• Builds targeting 400+ HP with supporting mods

Perfect For: STi owners seeking maximum performance with proven power gains from Tomei's race-proven straight downpipe. Off-road use only.

Pro Tip: Get your ECU tuned immediately after installation - running a catless downpipe without tuning will trigger a check engine light and potentially unsafe conditions.

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

OFF-ROAD USE ONLY: This catless downpipe is designed for off-road and racing use only. Not legal for street use in emissions-regulated areas.

Maximize your STi's performance with Tomei straight race downpipe - catless, 3" stainless, +25HP/+30TQ, maximum flow, race-proven quality. Off-road use only.