Be sure to communicate very, very well with your tuner about the DA in your area. Your tuner will have to be careful that your tune does not go lean when your in those conditions. Most of the rest of us will never see anything like that. If your tune is dialed in at say 1000' above sea level conditions and then you run it WOT in those conditions there is a chance of leaning out pending on what AFR's were tuned initially. Small detail to take into consideration.