Well the info I have is from AMS in Dallas, TX...........they are the largest reseller of D&D exhaust since they are right down the street from them. They sell the full exhaust with quiet baffle for $605 + delivery, or with standard baffle for $545 + delivery. That is the only 2 options they offer, there is no performance baffle..........just the standard and quiet. The Borzilla is a completely different animal, it will kill your low end torque on anything less then a 114" build or larger......it was designed and tested for just that application. All Fatcats have the equal length headers, stepped headers, and are top notch quality compared to anything else.
There are different models for the 07's since there are some differences in the tranny mounts and some of the bends to accomidate the different size of the tranny. But all the pre '07 models are the same and also have the o2 sensors installed in them now.
Steve