THUNDERMAX EFI SYSTEM. PN#309-604. APPLICATIONS; M8 models 2024 Touring® Models - center cooledmotor. Excludes 2023-2024 CVO (VVT).EXHAUST NOTE; 18MM LAMBDA SONDE. Installing a ThunderMax EFI may be in violation with local or EU laws. The ThunderMax EFI may not comply to local or EU emissions regulations. Check this or install at your own risk. | 