I'm interested in 600cc injectors, and am not experienced like you are in tuning, that's why I ask. I don't need 740cc injectors either, but it's nice to know that we can keep everything peaceful. Also, I must be mentally challenged, cause when I drill a hole in something, the hole usually gets bigger when I pull the bit out. I'm not a jeweler and don't know the ins and outs of drilling a perfect hole, but I don't really think it can be done by hand(could be wrong). On a realistic note, I'd like to know when you have finished tuning a car with these injectors and if it was any easier then your friends car(this is what I wanted in the first place but you have to be....). Ya think there will be a wave of people with 1 or 2 cylinders leaning out? "I swear it's stock".....