November 2025 – ECUFILES Release
The McLaren 720S with Bosch ME17.8.33 ECU now has a truly clean catalyst-off solution from ECUFILES.
When owners remove the catalytic converters for track use or aftermarket exhausts, most files on the market disable far too much. They switch off the first lambda sensor, camshaft diagnostics and other systems that have nothing to do with the catalyst itself. The result? Lost diagnostics, warning lights and reduced long-term reliability.
Our approach is different. We only disable what truly needs to be disabled for catalyst removal. Everything else stays 100% functional. The first lambda sensor continues to work normally, camshaft diagnostics remain active, and all safety systems operate exactly as they should.
This clean method keeps the car fully diagnosable with any OBD tool. In many cases, we also arrange readiness_ok, meaning the OBD readiness test is passed without issues – perfect for regions with emissions testing.
Why choose this file?
- No unnecessary disabling of unrelated systems
- Full diagnostics remain active
- No warning lights or error codes
- Safe and reliable for daily or track use
- Readiness_ok in many cases for easy MOT/inspection
This clean catalyst-off file for the McLaren 720S ME17.8.33 is already available in your ECUFILES account.
Drive safe and enjoy the unrestricted exhaust sound – the clean way.
