Active Autowerke F8x BMW S55 M2C / M3 / M4 Downpipes w GESI G-Sport Cats

Unlock the true performance and sound of your BMW S55-powered platform with the Active Autowerke Catted Downpipes, engineered for the F87 M2 Competition, F80 M3, and F82 M4. Designed with precision and built using premium materials, these downpipes deliver improved turbo response, increased power, and a more aggressive exhaust note - without the common drawbacks of cheaper alternatives.

Featuring 4" GESI G-Sport Gen 2 ultra high-flow catalytic converters, this setup is engineered to maintain efficiency while significantly reducing backpressure—resulting in stronger performance across the entire RPM range.

Key Features

• Direct fit for BMW F8X S55 platform (M2C, M3, M4)
  
• 4" ultra high-flow GESI G-Sport Gen 2 catalytic converters
  
• Designed to minimise or eliminate CEL (Check Engine Light)
  
• Improved turbo spool and throttle response
  
• Increased low-end, mid-range, and top-end performance
  
• Less restrictive exhaust flow for higher boost efficiency
  
• Cast stainless steel V-band for precise fitment
  
• Accepts OEM O2 sensor heat shield
  
• Bolt-on installation – no cutting or welding required
  
• TIG-welded 304 stainless steel construction
  
• Rated for 500–850 horsepower applications
  
• Withstands temperatures up to 1500°F
  
• Reaches operating efficiency within seconds of startup

Performance Benefits

Designed to maximise the S55 engine’s potential.

• Faster turbo spool and improved boost response
  
• Noticeable gains in horsepower and torque
  
• Enhanced exhaust flow for tuned applications
  
• Stronger mid-range pull and top-end power
  
• More aggressive exhaust tone without excessive drone

GESI G-Sport Catalytic Technology

Advanced catalytic performance without compromise.

• 400 cell per square inch ultra high-flow design
  
• EPA registered and OBD2 compliant (non-CARB regions)
  
• Proprietary precious metal loading for reduced emissions
  
• Helps prevent CEL related to catalytic efficiency
  
• Full 304 stainless steel substrate for durability

Build Quality

Manufactured to the highest standards.

• TIG-welded 304 stainless steel construction
  
• Furnace-brazed catalyst substrate for strength
  
• Precision engineering for perfect fitment
  
• Built to withstand extreme heat and performance use

Installation

• Direct bolt-on replacement for OEM downpipes
• No cutting or welding required

Professional installation highly recommended

Installation available at Sequential Racing – Altona North, Melbourne

Vehicle Fitment

• BMW F87 M2 Competition (S55)
  
• BMW F80 M3 (S55)
  
• BMW F82 M4 (S55)

Important Notes

• Not legal for use in California (CARB restrictions)
  
• Designed for high-performance and off-road applications depending on region
  
• Warranty may be void with excessive burble settings

Warranty

• 5 Year / 50,000 Mile warranty (shell and tube ends)
  
• 2 Year / 25,000 Mile warranty on catalytic core

Why Choose Sequential Racing?

Sequential Racing supplies premium performance upgrades for BMW M and GR platforms, focusing on proven products that deliver real-world results.

• Trusted performance gains
  
• High-quality GESI catalytic technology
  
• OEM-level fitment with enhanced performance

Upgrade your BMW S55 platform with Active Autowerke Catted Downpipes and experience improved power, faster spool, and a true M-car exhaust tone.