Once again BPG sets the standard for excellence. This time installation of Dinan upgrades on my new (to me) E39 M5. Everything done in a timely and super sanitary manner. Also, the advice on what to do, as well as what not to do, is refreshing in an industry not known for perspective and customer comes first mentality. Anyone who cares about their car is making a serious mistake in not giving this team a try. Thanks again for a wonderful experience!