if you have the stock res and its still solid, leave it. a glass pack in its place does the same thing, not really a performance upgrade, its just flat out cheaper to buy a glass pack.
the fans you need to have the pcm tuned to turn on at a lower temp, a 180 t stat is worth less with out the fans being tuned. this can only be done with a tuning program. via a local or a caned tuned pcm from a vender, dealer wont do it that for sure.
this is a 32 inch glass pack i installed on my car, the stock res rotted out, this cost 25 bucks, then 10 for the flange,another 10 to get it welded on the glass pack. 50 vs over 100 for the same thing. priceless.
