Unless you already have purchaced the 480cc injectors, Deatchworks also offers 550, 650, 740, and 810 cc injectors. We're using the 550 cc versions which cost about $40 more per set than the 480cc units. Just something to think about. As Stoney said "You can tune bigger injectors to run decent at idle but you cant tune smaller injectors to put out more fuel then they can".