For the 600WHP Im currently working on, Im curious what supercharger would be the best bang for the buck along with some other s/c related questions. First of all when a site gives you rating such as increase from 260hp to 390hp. What will that be referring too? Max output of the s/c or just general 5-10psi. Also how do I know what is compatible for what im looking for? For example, lets say I go with one that says the 260-390. Can I safely push them much higher in psi?