With a good tune you could be around 600hp. Upgrading the injector size will dictate whether or not a CP3 is needed, and depending how big you go you will also need a bigger turbo.I have a 06 5.9 6spd. And my current mods are Gauges, FASS 150, ARP Studs, Valair Triple Disc Clutch, and a 62/68 with billet wheel. Sold my TNT-R and am gettin EFI. But i wanna know if a CP3 upgrade is next or some different nozzles. And with my current parts and efi what power am i pushin approximately?