ok, i've read pretty much every post on this site and all the articles on turbos but i'm still lost. i don't understand "a/r" or the "trim". i don't know wtf to think, i'm soo lost, this is drivin' me crazy. and i can't really find any sites that give me lots of specs. so i can compare and try to figure out what means what. like cfm's and psi...which means what??? this is soo fuckin' confusing. somebody please help me...thanks a lot.