They have different kits for different vipers. Make sure you ask for the right one. You are in here on the gen 3 side, (no listing of what car you have) and some of the gen 2 guys are responding. So pricing might be different for the different versions.
I can recommend Woodhouse Dodge for install (they've learned a few lessons), and Underground racing has a solid following too. DIY isnt all the fun, trust me, I tried it on a gen 2
(you seem to get much better support from the reseller then you do the actual manufacturer, so pick a good reseller !!)
Jon