swap out all your block and head internals with beefier counterparts to withstand all the beating and boosting you'll be doing to the engine. Don't forget new darton sleeves to keep the block safe. Bigger injectors, most likely gonna need 750cc injectors for 15 psi or why not just spring for the 1000cc. The most important thing your gonna need is a respectable tuner to tune your ecu to manage the timing, fuel/air mixture and give you a 3bar map.