ive been searching alot tring to figure out tuning. and ive read alot about you have to have a wide band. how do mail order tune work with out a wide band. im tring to tune my dads 03 2500HD 6.0 and its bone stock with magnaflow exhaust. what tables to i want to mess with and what ones should i stay away from with out having a wide band? thanks for the help Lance