This guy I work with decided he wants to dump his carburator and go with fuel injection. So he orders up the Holley 4Di system. spends around $1400. We spent a week setting up the fuel map (My laptop) to get it perfect for him on his 454. His friends dont understand it and they talk him into getting a stock TBI setup. He gives me the 4Di! I already have the 2D system so putting it on will be a cinch!