Mr. DLeno, First of all, Thank You, for all Your posts regarding the different "boxes" that are available to us. I appreciate all the information You have passed-on to us, also. I have an '03,HO, 6-sp, 3. 73. , with an A. F. E. Pro-guard 7 System and a 4" Magnaflow muffler, and a X-Monitor (pyro & boost). I'm not interested in making a "rocket sled" out of my truck, just a little more power than stock, primarily for towing. I had, originally, planned on an Edge EZ until I heard about the VA Duration box. I was all set to buy the VA until I started reading, on the TDR, about this box setting a code. (Do You know what this code is?) Initially, I thought this box might be the answer because it did not raise the "rail preasure". Now, because of the "code", I am not sure. Would I be better-off using the Edge EZ and just taking it easy? Any thoughts You may have would be greatly appreciated. Thank You, in advance, for Your help. Joe. PS- Is there another choice, in boxes, that I should be considering?