hello there, i have 18-19 psi of boost on 62mm scpuley, stock fueling system and full of modes dcai ,downpipes,82mm tb, etc.. car havre stabile 370 whp, want some info on 21 psi of boost i can do stacked pulleys but i need sl55 pump and bosch 550 injectors both are plug and play, and thats all? car will run on right afr? nothing else?