Well I'm finally ready to take the step to more power. Truck is a 2001. 5 CTD, 4X4, automatic. I'm looking for a bit more oomph when towing my camper and horse trailer (about 15000 GCVW). I'm leaning towards the Edge EZ since I haven't done any transmission mods, however I have seen a few posts that say to get the Edge Comp because it will give you the same thing as the EZ, but can have more power if I decide I need more down the road. What do you all think? Where is the best place to buy an Edge box? Any problems with purchasing a used one? What's the deal with the boost elbow? I have been running a full set of gauges (boost, pyro, transmission temp, fuel pressure) so I have a pretty good baseline. Any issues with the install? Thanks for the help!