Breck,
With a completely stock trans, and nothing more than an ez, I ran 16. 5's. On my truck, even with just the ez, the trans felt like it wasn't getting the power down. With your stock trans, i don't know how much of your extra power will actually make it to the tires.
I'm sure john is right though, with a upgraded trans i'd guess you could run in the 15's easy. I ran a 16. 1 on just my injectors after I had the DTT trans. An ez on top of that would have been somewhere in the 15's worst case.
Good luck and you won't believe the difference that DTT trans will make.
Chris