Doesn't have to be Mopar, I just like the tips. And loud doesn't bother me.
Actually after further investigation, and talking with Collector's Choice, I may consider going with the Snake Oyl rear sub assembly.
I like their product because it does exactly what I want. It gets rid of the rear muffler, thereby saving a little weight and giving a better sound, and it gets rid of the ugly stock tips. It is pretty affordable and I can go back to stock quickly.
My 2001 Z06 was heavily modified, some of which I couldn't go back to stock even if I wanted. With the mods I want to do to my Viper, I want to keep everything so I can swap back if I ever want to sell the car or just keep at as a collector.