BMW 335i N54 3.0L Twin-Turbo Catless Downpipes (2006–2013)

BMW 335i N54 3.0L Twin-Turbo Catless Downpipes (2006–2013)

Maximum Exhaust Flow. Faster Turbo Response. Unleash N54 Performance.

Unlock the performance potential of your BMW 335i with the SimuFlow Catless Downpipes, engineered for compatible E90, E91, E92, and E93 models equipped with BMW’s legendary N54 3.0L twin-turbocharged inline-six engine.

Designed to eliminate the restriction of the factory catalytic converters, these performance downpipes provide a more direct exhaust path, helping reduce backpressure, improve turbocharger efficiency, and deliver a louder, more aggressive exhaust note.

Whether you’re building a high-horsepower N54 setup or upgrading your BMW for dedicated track use, the SimuFlow Catless Downpipes are designed to support increased exhaust flow and demanding performance applications.

Key Features

• High-Flow Catless Design: Eliminates the factory catalytic converters to reduce exhaust restriction and maximize exhaust flow.
• Twin-Turbo Performance: Designed to support the exhaust demands of BMW’s N54 twin-turbocharged engine.
• Enhanced Turbo Response: Reduced exhaust backpressure can support quicker turbo spool and sharper throttle response.
• Optimized Exhaust Efficiency: Promotes improved exhaust gas evacuation, particularly under increased boost pressure.
• Aggressive Exhaust Sound: Produces a louder, deeper exhaust note with enhanced turbocharger sound.
• Performance Tuning Potential: Designed to complement ECU calibrations and supporting engine modifications.
• Vehicle-Specific Fitment: Designed for compatible BMW E9x models equipped with the N54 engine.

Performance Benefits

Maximum Exhaust Flow

The catless design removes the restrictive factory catalytic converters, allowing exhaust gases to exit the twin turbochargers more efficiently. This helps reduce backpressure and supports improved performance under demanding conditions.

Enhanced Twin-Turbo Efficiency

Reducing exhaust restriction can help the N54’s twin turbochargers operate more efficiently, particularly on modified vehicles running increased boost pressure.

Aggressive N54 Exhaust Note

Experience a more pronounced exhaust tone, enhanced turbocharger sound, and the distinctive character of BMW’s twin-turbocharged inline-six engine.

Vehicle Compatibility

• Make: BMW
• Model: 335i
• Chassis: E90 / E91 / E92 / E93
• Advertised Years: 2006–2013 (N54-equipped vehicles only)
• Engine: 3.0L N54B30 Twin-Turbocharged Inline-Six
• Configuration: Catless Downpipes

Note: Not compatible with N55-equipped vehicles unless specifically confirmed. N54 availability varies by model year, body style, and market.

Important Information

• For competition/off-road use only where legally permitted.
• These downpipes remove the factory catalytic converters and are not legal for use on pollution-controlled vehicles on public roads in the United States.
• Professional installation is recommended.
• Installation may trigger a check engine light.
• ECU calibration may be required depending on the vehicle’s configuration.
• Verify exact engine type and vehicle compatibility before purchasing.

Shipping & Delivery

Estimated Delivery Time: 15 Days

Your SimuFlow High-Flow Catted Downpipe is carefully prepared and shipped to ensure it arrives safely and in excellent condition.

Please allow approximately 15 days for delivery from the date your order is placed. Delivery times may vary slightly depending on your location and shipping conditions.