Description
The Evolution Racewerks Sports Series High Flow Catted Primary Downpipes are engineered to dramatically reduce exhaust restriction and improve overall performance for the 2018–2023 BMW M5 and M8 equipped with the S63M twin-turbo V8 engine. The factory primary catalytic converters contain dense ceramic honeycomb structures that significantly restrict exhaust flow, slow turbocharger response, and limit horsepower potential. By replacing them with Evolution Racewerks’ high-flow 200-cell metallic catalytic converters, you gain more efficient exhaust scavenging, increased horsepower, quicker turbo spool, and sharper throttle response.
These downpipes are built entirely from 304 stainless steel, mandrel bent for optimal flow, and TIG welded in-house in the USA. A precision CNC-machined 3.5-inch V-Band flange replicates the factory turbocharger mounting geometry, ensuring leak-free sealing and perfect alignment. The factory O2 sensor positions are retained, and all brackets are CNC machined or laser cut for precise fitment. The system is 100% bolt-on and fully compatible with the OEM or any aftermarket secondary downpipes.
The included metallic catalytic converters withstand higher temperatures than factory ceramic units, offer significantly higher flow efficiency, and are more durable and lighter. This design helps maintain backpressure at optimal levels while dramatically increasing performance potential. All downpipes come standard in brushed finish, with an optional high-temp ceramic black thermal coating to reduce underhood heat and further improve efficiency.
Manufactured with exacting standards, these downpipes deliver increased power, improved sound, and long-lasting durability backed by Evolution Racewerks' Limited Lifetime Warranty.
Fitment Information
Direct fit for BMW S63M twin-turbo V8 engine applications:
- BMW M5 (F90) - 2018–2023
- BMW M8 (F92 Coupe / F93 Gran Coupe) - 2018–2023
Replaces the primary catalytic converters. Compatible with factory or aftermarket secondary downpipes.
Key Features
- Made in the USA and manufactured in-house
- Designed for 2018–2023 BMW M5 (F90) and M8 (F92/F93) with the S63M engine
- High-flow 200-cell metallic catalytic converters
- Higher max horsepower capability
- Faster, stronger, and longer torque curve
- Improved throttle response and quicker turbo spool
- Mandrel bent 3-inch piping
- Smooth transitions for optimized exhaust flow
- 100% 304 stainless steel construction
- 100% TIG-welded for maximum durability
- Precision CNC-machined 3.5-inch turbocharger V-Band flange
- CNC-machined O2 sensor bungs and laser-cut brackets
- Retains factory O2 sensor locations
- Brushed finish standard
- Optional high-temperature black ceramic thermal coating
- Compatible with OEM or aftermarket secondary downpipes
- Includes all installation hardware
- Track-tested durability
- Limited Lifetime Warranty
Performance Benefits
The factory primary catalytic converters create major flow restriction due to the dense ceramic honeycomb design. The Evolution Racewerks Sports Series uses a 200-cell metallic core that dramatically increases exhaust flow by reducing cell density and enlarging each passageway. This results in:
- Increased horsepower output
- Faster turbo spool
- Reduced turbocharger lag
- Sharper throttle response
- Improved overall engine efficiency
- Higher temperature resilience and long-term durability
- Reduced weight compared to OEM ceramic catalysts
Metallic catalysts handle extreme heat more effectively and maintain structural integrity far better than ceramic units, making them ideal for performance applications.
Construction Quality
Evolution Racewerks builds each downpipe using:
- 304 grade stainless steel
- Mandrel-bent tubing for consistent diameter
- TIG-welded joints for maximum strength
- CNC-machined billet stainless steel V-Band flanges
- CNC-machined O2 sensor bungs
- Laser-cut mounting brackets
- Optional Type III black ceramic thermal coating (rated to 2000°F)
Each component is engineered to withstand extreme temperature, boost pressure, and long-term use without compromise.
