ScottytooHotty's 10mm cub on Planetsand, put out over 130 hp's on a stingy dyno....The powervalve just controls where you want the power, up top or on the bottom, personally I would go with a big cub before a powervalve regular cheetah or T-Rex.....I've also seen a 7mm cub at Little Sahara in OK, in a stock frame, outrun a 10mm T-Rex in a drag chassis, time and time again, if you want the names of the people pm me and I'll tell ya, I'm NOT gonna post there names on here