Evolution Racewerks Competition Series Catless Downpipes – BMW M5 (G90, S68)

OVERVIEW

Evolution Racewerks Competition Series Catless Downpipes for the S68 twin-turbo V8 in the 2025+ BMW M5 (G90). The S68 uses two primary and two secondary catalytic converters, four in total, and their dense honeycomb cores are among the largest restrictions in the exhaust. This complete set replaces both the primary and secondary sections, so exhaust flow is unrestricted: peak horsepower climbs, torque arrives sooner and harder, and throttle response and turbo spool sharpen.

Built in-house in the USA from 100% 304 stainless steel with mandrel-bent 3" tubing and 100% TIG welds. The 3.5" turbine-housing V-band flange is CNC machined from billet 304 stainless, the O2 sensor bung sits in the factory location and the brackets are laser cut and TIG welded with stainless rod, so installation is 100% bolt-on with no compatibility issues with the factory exhaust or an aftermarket system.

SPECS

• Catless design for maximum exhaust flow
• Replaces both the primary and secondary downpipe sections
• Mandrel-bent 3" piping with a smooth transition into the exhaust
• 100% 304 grade stainless steel construction
• 100% TIG welded, manufactured in-house in the USA
• CNC machined billet stainless 3.5" turbocharger V-band flange
• CNC machined stainless O2 sensor bung in the factory location
• Laser-cut stainless brackets TIG welded with stainless rod
• Retains the factory slip-on style connection; 100% bolt-on
• Finish options: Brush (default), Mirror Polish, or high-temperature Black Ceramic Thermal Coating
• Ceramic Thermal Coating lowers underhood temperatures and keeps exhaust gas velocity up (black only)
• Higher peak horsepower curve and earlier, stronger torque curve
• Sharper throttle response and faster turbo spool
• Compatible with factory or aftermarket exhaust systems
• Track tested durability
• Shipping weight: approx. 21 lb
• Limited Lifetime Warranty

PARTS INCLUDED

• Competition Series catless primary and secondary downpipes (complete set) in the selected finish
• All hardware required for complete installation

TECH RESOURCES

Additional Parts Required

• ECU tune (required): removing or replacing the factory catalytic converters will set catalyst efficiency fault codes without software: Burger Motorsports JB4 Tuner – BMW M5 (G90/G99, S68).
• No additional hardware is needed; all installation hardware is supplied by Evolution Racewerks.

Installation

• Evolution Racewerks does not publish an installation guide or video for this part.
• Contact Speed Logic for installation support or fitment questions.

Notes

• For OFF-ROAD / RACE USE ONLY and not emissions legal for street use. Not for sale, installation or use on licensed vehicles in California.
• Also available for these cars: Evolution Racewerks Competition Series Catless Primary Downpipe, Evolution Racewerks Competition Series Catless Secondary Downpipes, Evolution Racewerks Sports Series High Flow Catted Downpipes, Evolution Racewerks Sports Series High Flow Catted Primary Downpipe.

PART NUMBER

• BM-EXH038S — Brush Finish
• BM-EXH038P — Polish Finish
• BM-EXH038TB — Ceramic Thermal Coating

VEHICLE APPLICATIONS