ok i am putting together a turbo kit and i want to know what size injectors are good for 400 whp vs 300whp and also what kind of exhaust am i going to need keep in mind i am tired of the loud exhaust. i do not want to hear it, if poss. currently i have a 2.5 in custom flowmaster with resonator. and its loud as hell. i know when i go turbo it will quiet down. but i want it as quiet as poss. but reach my goals. what do you guys and gals think?