Dinan is an aftermarket performance parts manufacturer that is fairly well known with the BMW name. With a history of building race quality parts, Dinan knows how to make performance parts that are also durable and will likely outlast the life of many other components of a car. Dinan’s relationship with BMW is something special, as with most aftermarket parts there can be warranty voiding. With Dinan however, your BMWs warranty remains intact. If there are any problems however, Dinan has been known to cover the problem. The S1 Package is a common choice when picking Dinan modifications, including their Engine Software, Free Flow Exhaust, High Flow Carbon Fiber Intake, Performance Springs, Bushings, Strut Tower Braces, and Pedal Cover Set among other options (which vary depending on car).