What is it This all-in-one performance upgrade transforms your standard BMW G80 M3 or G82 M4 into a track-ready weapon. By flashing factory CS engine calibrations alongside aggressive CSL chassis tuning, this bundle delivers a complete CS-spec transformation without requiring an invasive aftermarket ECU bench-unlock The Technical Stuff The package combines two premium software upgrades: BMW G80/G82 M3/M4 CS - DME Software Upgrade: Power Increase: Unlocks a jump to 550BHP (560PS) and 650Nm of torque using genuine OEM CS mapping. Top Speed Expansion: Bumps your electronic top speed limiter up to 188 mph (302 KM/H). Warranty Safe: Works seamlessly within the factory hardware safety parameters of your S58 engine. BMW CSL/CS - Software Upgrade: CSL EDC Calibration: Adjusts your electronic dampers for faster rebound control, sharper cornering, and less body roll. M-Differential & Traction Control: Re-calibrates the rear differential and MDM traction control to deploy the new 543bhp power limits. Steering Weight: Firms up the electronic steering rack for a more weighted, connected front-end feel. COMPATIBILITY - 2021+ G80 BMW M3 COMPATIBILITY - 2021+ G82 BMW M4 COMPATIBILITY - 2021+ G83 BMW M4 COMPATIBILITY - 2022+ G81 BMW M3 What’s Included BMW G80/G82 CS DME Tune: £380 BMW CSL/CS Handling Package: £220 Workshop Appointment: Professional, hands-on installation at the workshop in Horley, Surrey. Remote Coding: Flash from any driveway using a Windows laptop, stable Wi-Fi, and an ENET coding cable.