Description
The Evolution Racewerks Competition Series Catless Secondary Downpipes are engineered to unlock significant power gains from the 2025+ BMW M5 G90 equipped with the twin-turbo S68 engine. By removing the restrictive secondary catalytic converters, these downpipes greatly reduce backpressure, improve turbo efficiency, and deliver faster spool, stronger torque, and sharper throttle response.
Manufactured in-house in the USA from 304 stainless steel, these downpipes use mandrel-bent 3-inch tubing for optimized flow and smooth exhaust transitions. With precision CNC-machined V-band flanges, TIG-welded construction, and factory-style slip connections, they install seamlessly and are designed for long-term reliability in both street and track environments.
Because these replace only the secondary catalytic converters, located after the secondary O2 sensors, they do not trigger a Check Engine Light (CEL).
Fitment Information
Direct fit for:
- BMW M5 (G90): 2025+
- S68 twin-turbo V8 engine
Replaces factory secondary catalytic converters.
Compatible with OEM primary catalytic converters and all exhaust systems designed to mate with the factory secondary section.
Key Features
- Made in the USA and manufactured in house
- Designed for the 2025+ BMW M5 G90 S68 engine
- Will not trigger a Check Engine Light (CEL)
- Increases maximum horsepower capability
- Higher initial torque curve with faster and stronger torque delivery
- Faster turbo spool up and improved throttle response
- Mandrel-bent 3-inch stainless steel tubing for maximum flow
- 100 percent stainless steel construction
- 100 percent TIG-welded for strength and precision
- Precision CNC-machined turbocharger V-band flange
- Brushed finish or optional mirror polish
- Optional high-temperature black ceramic thermal coating to reduce underhood heat
- Factory slip-on style connection retained
- Compatible with factory or aftermarket exhaust systems
- Track-tested for durability
- Includes all installation hardware
- Limited Lifetime Warranty
Performance Benefits
Turbocharged engines are extremely sensitive to exhaust restrictions. The factory downpipes contain catalytic converters made from dense honeycomb material that introduces significant backpressure and turbulence. By removing the secondary catalytic converters, these Competition Series Downpipes improve flow velocity, reduce restrictions, and allow exhaust gases to exit more efficiently.
This results in:
- Stronger horsepower gains
- Quicker and higher torque delivery
- Faster turbo spool
- Reduced exhaust backpressure
- Sharper throttle response
The difference is noticeable immediately.
Construction Quality
Each downpipe is crafted from 100 percent 304 stainless steel, mandrel-bent for consistent diameter, and welded using TIG processes for exceptional strength and finish. Evolution Racewerks machines their billet 304 stainless V-band flanges in-house for precise turbine housing alignment. OEM-style hangers, O2 bungs, and brackets are CNC-machined or laser cut and TIG welded into place. Installation is fully bolt-on using factory-style slip connections.
The downpipes ship standard with a brushed finish.
Secondary Downpipe Specifics
The BMW G90 M5 uses four catalytic converters: two primary and two secondary. These Competition Series Downpipes replace only the secondary converters. As these are located downstream of the secondary O2 sensors, replacing them does not affect catalyst monitoring and does not trigger a Check Engine Light (CEL). They will mate with the factory primary section or any aftermarket primary downpipes.
Ceramic Thermal Coating Option
An optional high-temperature ceramic coating is available to reduce underhood heat radiation and maintain higher exhaust gas energy inside the pipe. Benefits include:
- Lower underhood temperatures
- Reduced heat soak of nearby components
- Higher exhaust gas velocity for reduced backpressure
- Added corrosion resistance
This thermal coating withstands temperatures up to 2000°F and is available exclusively in black due to heat durability requirements.
