I've got a stock 00 cummins,4x4,xcab,automatic with billet convertor and hop'd up trans,AFE intake,4" straight through exaust,Edge 5 level box. I want to purchase injectors and turbo,but don't want to replace the head studs.How much HP can I get before doing the studs and what else do I need for around 550HP?...what combo's have u guys tried? Mostly street driving,towing a 10k # trailer every other month..my turbo is currently stock and untouched along with the motor..Going to install gauges this month too..thanks,cameron..anyhelp would be great for me the rookey..