ADRO - BMW G82 M4 - G82 M4 REAR DIFFUSER V1 - A14A40-1301ADRO BMW G82 M4 G82 M4 REAR DIFFUSER V1 A14A40 1301 A14A40 1301 Make that quad exhaust pop even more with the ADRO carbon fiber rear diffuser for the G8X BMW M3 M4. Featuring a more aggressive design, carefully engineered aero, and a beautiful carbon fiber finish, this is by far the highest quality and most aggressive rear diffuser currently available for the G8X platform. Learn more about our BMW G8X M3 M4 Facelift Kit. REAR DIFFUSER SPECIFICATIONS