I made a sort of bad decision by getting the 07 Durango with the 3.7L. I have no problems with the truck except for the 3.7, is there any performace upgrade that I can add to my durango to give it a boost.  

I know JBA makes some headers for the 3.7. JET Performance makes a module that I think will work with the 3.7, and I've found several companies that make intakes and exhausts for it. The 3.7 V6 is essentially the 4.7 V8 with two cylinders hacked off, so a lot of bolt-ons will interchange (with the exception of headers, of course). Hope this helps.