For over 30 years, Active Autowerke has set the benchmark for BMW performance. Built on precision engineering and relentless innovation, our mission is simple — extract every ounce of potential from your BMW.
The latest addition to the F90 M5 collection, these S63TU downpipes are designed to unleash your M5’s true power. By removing the restrictive factory bottlenecks, they dramatically reduce heat and turbo lag while delivering noticeable gains in horsepower and torque across the entire RPM range.
Each set is manufactured in-house in Miami, Florida from TIG-welded 304 stainless steel and inspected for perfect fitment. The design features a factory-matched 3.5” V-band inlet that tapers into a high-flow, mandrel-bent body, including the lower “mid-pipe” section many others sell separately. The system retains the OEM O2 sensor heat shield, keeping your engine bay clean and stock-looking for a stealth, sleeper appeal.
This version includes a pair of 4.5” GESI Ultra High Output (UHO) catalytic converters, which provide maximum flow and durability while remaining 49-state EPA compliant and OBD2 safe—all without triggering a check-engine light.
Key Features
- No CEL when using this downpipe
- GESI EPA-registered, high-flow cats (49-state compliant)
- 4.5” mandrel-bent piping for maximum performance
- Quicker turbo spool and sharper throttle response
- Precision-cast stainless steel V-band connections
- Direct bolt-on fitment – no cutting or welding
- TIG-welded 304 stainless steel construction
- Ultra high-flow 400 CPSI catalyst
- Rated for 500–850 hp applications
- Withstands up to 1500°F
- Achieves operational efficiency within 9 seconds of startup
- Retains OEM O2 heat shield for a stealth look
- 5-Year / 50,000-Mile Warranty on shell and tubing
- 25,000-Mile Warranty on catalytic core
- Made in Miami, Florida
Vehicle Fitment
BMW M5 and M8 — F90/ F9X chassis, 2019 and newer