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I have the Stage 1 Dinan package installed in my 2015 M4 Convertible. It was installed 5 months ago (a few weeks after I picked up my car). I have about 5,000 miles on it. I love the everyday torque in the mid range. I have had two guys who track their 911 4S and can not believe how fast my car is and how it handles vs their 2011 911 4S. I could not be happier. For me it was worth every penny and the piece of mind with a $90k car. There is a great post of more detailed information of the Dinan Stage 1 real world experience in a different thread. Search for Dinan in the M3/M4 post section and you should find it. It will give you more real world experience from people who have this installed on their cars.
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