Z1 has excellent tuning skills and has tuned many cars with big injectors to idle right. It may seem like over kill but if I ever upgrade turbos or decide to spray Ill have the capabilities. Do it big and do it right the first time and you dont have to correct later on. The injectors wont cause me to have bad mpg. They only flow as much gas as I tune them to. I already have a boost controller. Im hoping Z1 will tune it before Nationals. Depends on build time.