hi, i'm about to buy twin turbo for a friends car the car has forged pistons and rods and whe already changed heads and intake whe put 2001 mustang heads and cams and whe put adjustable cam gears and whe retard both cams 2 degrees i whant to put 15 pounds of boost the kit comes with 42 pound injectors for 8 pounds i think with that boost should i get bigger ones? i thougt at least 50 pounds, any tips on buelding this project?