I purchased this DinanTronicElite piggy back for my N26 which in stock form was running excellent. After installation I recieved Drivetrain Malfunction warnings. I replaced OEM Coils, Spark Plugs and a Waste Gate Acuator still maintained issues. After talking with a Service Manager of a promenent BMW dealership that was a Dinan distributor he informed me of constant issues with the unit then the dealership discounted affiliation. User's recommendation: Avoid at all cost research other company units.