RE: REPLACE STOCK RADIATOR OR NOT?
I'm not really convinced about the tstat, but I agree with BootCamp on everything else. The Cai and Predator tunes are excellent upgrades at relatively low cost. I got an AFE cai because you don't have to oil the filter as you do on most other systems, and the oil can sometimes mess up the MAF sensor. The exhaust is really good on the stock SRT, and a really good replacement will only net you 12-15 HP and 20 ft/lb on the torque. As for the other stuff, speed costs money. So how fast do you wanna go?