The owner of a speed shop near me was quoting me prices on procharger set ups and offered me a D1SC that is on a shop test vehicle for 4500 total for the kit, dyno tune and install including tax. The kit has a little under 6,000 miles on it and they're now going to build the car N/A. Does that seem steep for a used kit with that amount of miles? Any reliability issues? The car isn't their race car (they have a supercharged 408 SN95 for that) so it's 99.9% street use with a few runs down the 1/4.