If you do a search on 720cc's you'll seee that fuel mangment is a must to even get a good idel. They are a more WOT injector's made for hauling ass down the track. Those that get a good idel on their car, they said their rpm's are set higher to keep the car from dieing etc. Plus a 555cc injector set is been proven here on the forum good for over 550rwhp. So unless your shooting for the stars, you might never even need anything bigger than the 555. Don't look at them as so small, cause if you feel the power of a stock 370cc pushed to 15-16psi. That's a hard pull. Now imagen a 555cc pushed at 24-25psi ( with all other modds added to run this safe )........... :)
