Still calling bs on those numbers even with your mods.... with a cai, exhaust, and superchips my 05' only put out 276rwhp and 301rwtq.... and I got the slips to prove it. Sorry man our trucks suck at putting power to the wheels, its right around a 26-28% loss from the engine to the wheels. Only way I could see you getting those numbrs would be if you just added the manufacturers suggested increase to the stock 345hp rating which a lot of people do.