I am very interested in getting the GIAC X+ sofware. I asked AWE if what I was running on my car right would be OK. Basically a Forge 007DV and a 3"-2.5" Milltek turboback exhaust. The fellow mentioned that GIAC DOES NOT recommend a 3" exhaust. Does anyone here have this setup, GIAC X+ and any 3" DP exhaust? I am just curious why a more "open" exhaust is not recommended. Thanks in advance.