Description
The Evolution Racewerks Sports Series High Flow Catted Primary Downpipes are engineered to dramatically improve exhaust flow and performance on the 2025+ BMW M5 G90 equipped with the twin-turbo S68 engine. These downpipes replace the restrictive factory primary catalytic converters with high-flow 200-cell metallic cores that support greater horsepower, faster turbo response, and reduced backpressure while maintaining catalytic functionality.
Built in-house in the USA from 304 stainless steel, these downpipes utilize mandrel-bent 3-inch tubing and precision CNC-machined 3.5-inch V-band turbo flanges for a perfect OEM-style fit. The high-flow metallic catalyst withstands higher temperatures than ceramic factory units and offers significantly improved durability, flow capacity, and spool characteristics.
Fitment Information
Direct fit for:
- BMW M5 (G90): 2025+
- S68 twin-turbo V8 engine
Replaces factory primary catalytic converters.
Compatible with factory or aftermarket secondary downpipes and all exhaust systems designed for OEM primary locations.
Key Features
- Made in the USA and manufactured in house
- Designed for the 2025+ BMW M5 G90 S68 engine
- High-flow 200 cell metallic catalytic converter
- Increases maximum horsepower potential
- Higher initial torque curve with faster and stronger torque delivery
- Faster turbo spool and sharper throttle response
- Mandrel-bent 3-inch stainless steel tubing
- 100 percent stainless steel construction
- 100 percent TIG-welded for superior strength and finish
- Precision CNC-machined turbocharger V-band flange
- Brushed finish or optional mirror polish
- Optional high-temperature black thermal coating to reduce underhood heat
- Compatible with the factory or aftermarket secondary downpipes
- Track-tested durability
- Includes all necessary installation hardware
- Limited Lifetime Warranty
Performance Benefits
Factory primary catalytic converters use dense ceramic honeycomb material that creates substantial restriction, turbulence, and heat retention. By replacing them with high-flow 200-cell metallic catalyst cores, these downpipes dramatically reduce backpressure and allow exhaust gases to exit more efficiently.
Benefits include:
- Increased horsepower capacity
- Faster turbo spool
- Reduced turbo lag
- Smoother and stronger torque delivery
- Improved throttle response
- Lower exhaust backpressure
The metallic catalyst also offers enhanced heat tolerance, longer lifespan, and reduced weight compared to ceramic factory converters.
Construction Quality
These downpipes are crafted from 100 percent 304 stainless steel and mandrel-bent for maximum consistency and flow. Evolution Racewerks machines the 3.5-inch billet stainless steel turbo V-band flanges in-house to replicate OEM geometry. All O2 bungs, brackets, and mounting points are CNC-machined or laser cut and TIG welded for long-term durability. The O2 sensors mount in the factory locations. Installation is fully bolt-on.
Downpipes come standard with a brushed stainless finish.
Primary Downpipe Specifics
The BMW G90 M5 features two primary catalytic converters and two secondary converters (four total). These Sports Series High Flow Catted Primary Downpipes replace only the primary catalytic converters. They are fully compatible with both the factory secondary downpipes and aftermarket secondary sections.
Ceramic Thermal Coating Option
The optional ceramic thermal coating helps contain exhaust heat inside the downpipe, reducing underhood temperatures and heat soak to surrounding components. Additional benefits include:
- Higher exhaust gas energy and velocity
- Lower backpressure
- Improved component longevity
- Added corrosion resistance
This coating is rated up to 2000°F and is available exclusively in black due to heat durability requirements.
