With new found funds I have been looking into picking up a twin screw for my cobra finally after 5 years of ownership. I have always favored KB but with the new whipple 2.9 I have been leaning torwards trying that route. I really am not sure about which size to get as far as Kenne Bell goes. I really want low 600ishWHP with just a stock engine minus CAI and exhaust. What is some of your guys opinion on these two super chargers? Next Fuel wise what should a guy do with in a reasonable price to upgrade his fuel system to support this amount of horsepower(beside injectors). I know about the boost a pump but prefer not to go this route.