my stock gears (or at least the gears i pulled out) were 2.73s, but i have a 98..

 

yeah i think the 99+ is a 3.27 but i could be wrong

 

stock v6 are 3.27

you will probably want the 3.73s with the FI so if you are completely serious about turbo then just get the 3.73. you will still get a big difference lol

i have 3.73s with my 5 speed and i cruise 5th gear at around ~38mph and up