About modding the Viper. A lot of people say you cannot mod the Gen 4 or 5. That statement is incorrect. The proper statement is that you can't tune the factory ECM. That doesn't keep you from modding a car. Look at all those twin-turbo Lamborghinis out there, Underground Racing has a waiting list for them to be built. NONE of them use the factory ECM. All of them require an aftermarket ECM to handle the engine controls when making that power. The same thing can be done with a Gen 4 or 5. You'll spend $6-10K on this engine management system, just like the Lambo guys do. But, it can (and has) been done. Anyone spending $100,000 on a car can afford a $6K computer system to make big power upgrades. I could twin-turbo my SRT '13 and probably still come in under the cost of a fully loaded GTS with the $15K paint job. If you want a twin-turbo 2013 Viper, you can have it built. Period.