A:Answer Hi there. Thanks for your great question! There's a few factors that could affect this such as if we installed the original set, when the install date was and what products we're looking at installing. Before you make any purchasing decisions, because we don't want to overcharge you, I'd recommend getting in contact with your local Best Buy's Autotech team to gather specifics. You can find information about your local store at www.bestbuy.com/storelocator.