Don't want to send your computer in and have your DD doind down time?

Check this out:
http://blackbearperformance.com/autocal.asp

I just found this, and this is the route I'll be going with my Sierra next year. (hopefully the price will drop a bit by then)

When you get it you log your data, email that data to Blackbear, they'll put a tune together using the data you sent them, and then send you the tune... You plug this into your computer VIA USB and load the tune to your PCM via your OBDII port (obviously). It can hold up to 5 tune programs at once so you can have your 93+ octane tune sitting waiting for the track night and run your 87 Octane tune for DD... keep stock just in case.

I don't want to sound like a walking advertisement but I just wanted to point out some other tuning options besides those from wait4me and PCMforless, not that they're no good, but I think this would be better.

 

this is a really cool idea... I might have to get this

 

I'm waiting until the snow melts before getting it, I won't be running my intake during the winter so I'm holding onto the stock tune.

I want better MPG's and to tone the torque management down in Tow-Haul mode. I hate having 300 hp and not baing able to get the tires to scream when I punch it from a stop. (Mind you the LS engines don't start making power until ~ 3000RPM)