One thing to remember is that
a Viper is V-10, not a V-8! That being said, I don't think you'll find
any exhaust system that will make a Viper sound like a V-8. Furthermore,
why would you want a Viper to sound like a V-8?
I added the Corsa CatBack system to my SRT-C. First of all, I challenge any V-8 to stop at a light and outrumble the V-10. At idle, there's a lopy percussion that virtually nothing else matches. (Other drivers are often observed to roll up their windows when they are stopped in my vicinity.)
In my neck of the woods, we had a "MetroCruise" this past summer (almost as big in attendance as Woodward, but far less of the ultraexotic street iron (e.g. Saleen, Aston Martin, etc.) I had many chances to "rev-up" against nicely tricked out Camaros, Vettes, GTO's, even Chargers and Cudas. There was no doubt as to who had the most BadAss sounding exhaust system every time! (I base this statement on observation of crowd reaction.) I can only imagine what headers without cats must sound like.
Don't judge the Corsa from the sound of the recording. Get a ride with anyone who has one and I'll bet you'll want one.
Please, just don't Fup your Viper and try to make it sound like a V-8!