Bull-X 3″ downpipe, Subaru WRX STI 2.5

Bull-X 3″ downpipe, Subaru WRX STI 2.5

A downpipe is one of the most popular upgrades for a turbocharged engine. Efficient exhaust flow is important for a turbo system, and a freer-flowing pipe can provide a sportier sound while improving throttle response and power potential. Read more about the different downpipe types in our Futurez guide.

This product does not have model-specific ECE approval. It is intended for motorsport and other off-road enthusiast use. Always check the current road regulations before installation.

Bull-X 3″ downpipe, Subaru WRX STI 2.5 is a vehicle-specific stainless-steel assembly for Subaru WRX STI 2.5 Turbo 300 hp. Its 76 mm / 3″ pipe size and freer-flowing design reduce exhaust back pressure and allow the turbocharger to operate with less restriction, particularly on tuned engines.

Lower back pressure can improve turbo response and throttle response while reducing thermal load on the exhaust side. The vehicle-specific design replaces the original component without unnecessary fabrication.

• Pipe diameter 76 mm / 3″
• Manufactured from stainless steel
• Vehicle-specific plug-and-play design
• Freer-flowing construction reduces exhaust back pressure
• Helps reduce thermal load on the turbo and exhaust side
• Optional integral heat shielding is available
• Connects to the original exhaust system
• Made in Germany

Catalytic-converter options

• With a 100-cell sports catalytic converter
• With an HJS 200-cell sports catalytic converter without model-specific ECE approval
• With a 200-cell sports catalytic converter
• Without a catalytic converter

The available catalytic-converter configurations do not include model-specific ECE approval. Do not use an unapproved product on public roads; always check the current road regulations.

Unapproved catalytic-converter options or a catalyst-delete version may trigger a fault code related to the downstream oxygen sensor. Any required software changes depend on the vehicle ECU and selected version.

The HJS 200-cell option carries an approval mark without vehicle-specific operating approval for the Subaru WRX STI. On request, the manufacturer can provide a 76 mm continuation for an EGO-X exhaust.

Examples of compatible vehicles

• Subaru WRX STI 2.5 Turbo 300 hp

Before ordering, verify the vehicle engine and body version and the exact vehicle coverage of the selected catalytic-converter approval.