viper brake kits

I have a front Kit and i got the calipers for 300 from http://www.donscharfautomotive.net/ from my understanding the vipers used a dual caliper setup for the rear. One for service brakes and one for parking. IMO there can't be much advantage to going viper rear caliper when you could get a good SVT cobra caliper setup from DR DIFF for much cheaper and in the long run will be lighter. Now if your going for the purist B.S then maybe. But chances are the Ford caliper is made in the same mexican plant as the the Viper one.