they dont have all that much money first off - or the car would b certified to sell as a dealership car in the US not a kit car-
Second they arnt running the same ammount of boost as the street flight kit -
plain and simple- their motor will last a whole lot longer than the one frmo street flight - and I would bet that theirs is a lot better off-boost v on-boost thatn the street flight kit-
Its apples and oranges -