Active Autowerke GESI Catted Downpipes – G87 M2 | G80 M3 | G82 M4 (S58)

Unleash the full potential of your BMW G87 M2, G80 M3, or G82 M4 with the Active Autowerke Signature GESI Catted Downpipes — engineered to deliver performance, reliability, and the refined tone your M-car deserves.

While the G8X platform offers incredible power, its factory exhaust leaves much to be desired — quiet, muted, and lacking the character of a true ///M. The Active Autowerke GESI Catted Downpipes, part of our complete Motorsport Collection, transform the sound and response of your S58 engine while maintaining emissions compliance in 49 states.

Built from TIG-welded 304 stainless steel and equipped with 4.5” GESI G-Sport Ultra High Output catalytic converters, these downpipes improve exhaust flow, reduce back pressure, and eliminate the harsh drone common with straight-pipe systems — all without triggering a CEL. The result: faster turbo spool, stronger midrange torque, and a deeper, more aggressive exhaust note that still retains everyday drivability.

Performance Benefits

• No CEL for catalytic efficiency with proper installation
  
• Quicker turbo spool and improved throttle response
  
• Reduced back pressure for increased horsepower and torque
  
• Deeper, throatier tone with smoother overall sound
  
• Lightweight, direct bolt-on design (no cutting or welding required)
  
• Durable 304 stainless steel with 1.5mm wall thickness for long life
  
• Maintains OEM 70mm connection for perfect fitment

GESI UHO Catalytic Technology

• EPA registered and OBD2 compliant (49-state legal; not CARB approved)
  
• Rated for 500–850 HP applications per cat
  
• Operates efficiently within 9 seconds of startup
  
• Handles sustained temps up to 1500°F
  
• 400-cell high-flow catalyst maintains performance and emissions balance
  
• Constructed entirely from 304 stainless steel, including substrate
  
• Proprietary GESI metal loading ensures reduced emissions and long-term reliability

Warranty

• 5 Year / 50,000 Mile Warranty – shell and tube ends
  
• 2 Year / 25,000 Mile Warranty – catalytic core (to original purchaser)
  
• Warranty void if vehicle produces excessive burbles beyond stock levels (may damage catalytic core)

Key Specs

• 3.0” primary piping with stainless flex joints
  
• Tapers smoothly to OEM 70mm diameter
  
• Designed, tested, and handcrafted in Miami, Florida, USA
  
• Direct-fit replacement for factory downpipes
  
• Works seamlessly with Active Autowerke mid-pipes and rear sections

Important Notes

• Off-road use only in California (not CARB legal)
  
• Federal law prohibits tampering with factory emissions equipment
  
• GESI cats meet or exceed EPA standards under Memorandum 1A

Why Choose Active Autowerke

For over 40 years, Active Autowerke has been the go-to brand for BMW performance engineering — delivering precision-crafted parts that combine reliability, power, and sound refinement. The Signature GESI Catted Downpipes for the G8X platform continue this tradition of innovation, transforming your M-car into the high-performance machine it was meant to be.