Do you want to install the new calipers on all 4 corners or just the rears/fronts? Either way, it's not a small endeavor. It has been done many times on many vipers, but it requires:
a big brake kit (the brackets that Dave is referring to)
2 or 4 SRT calipers (14")
an emergency brake kit for the rear
2 or 4 14" rotors
brake pads
might want to upgrade to stainless steel brake lines while you're doing this
To get the big brake kit on the rear installed, the ears on the rear hubs need to be cut off so that the big brake brackets can be installed...
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...this is Mark from IPSCO cutting on my rear hubs.