I have a stock 2003 auto gt.. once i get my 3.73's and my predator tuner in... what 1/4 mile times should i expect?

 

maybe a high 13 low 14

 

Dude...high 13? You're crazy. It's an auto. With a 3.73 gear and a hand held tuner. Low to mid 14's.

Can I just save you some greif and recommend that you don't bother with the 3.73 with an automatic? Go with the 4.10, or even the 4.30. To be honest. If that was my daily driver, I'd have a 4.30 gear and a big *** converter before ANY other mod in that car.