awesome! I have one of his tunes and love it, best decision I made as I got the tuner from him as well. You can knock down those 0-60 times. I'll post the picture if you like but I have mine down to 5.9 with open diff 3.55's
I've thought about a 4.10 upgrade as well but I think I'm just going to get a Limited Slip for the time being and run a smaller tire when I go to the track. Last time I went before I was tuned I ran a 14.9 so if this alone takes off half a second I'll be very happy.