y2ksrt (chris from kansas)is a mod with some good taste that adds value......
Oh you are just KILLING me here! But since you are such a nice guy, I will throw a new smilie your way to go with your sig...
As for major mods (to your Viper), most say to expect 10-30% of your investment on the return. Spend $10K in upgrades and expect $1,000 - $3,000 back. And even that is up in the air depending on how well the mods were done and by whom. If Billy Joe Bob slapped it together with duct tape, you may get a lot less than 10% - maybe closer to 1% or less. On the other hand, if it was a well known installer (Heffner, Levin, Cragin, etc.) that did the installation, you could see more than that on a return. Smaller mods like exhaust will get a decent return for name brands (Borla, Corsa, etc.), but you won't make a profit on them.
Bottom line is that NO mod will add enough value to offset the cost. That is just the way of the world. For those mods that people come to
expect on a Viper: Smooth intake tubes and hi-flow filter (K&N, etc.). The least expensive horsepower mod on any Viper, most do this first.
Hope this helps!