Currently have a 12 GT Premium and was thinking about having a TVS installed. When looking at the prices and figuring the price of my car it looks as though I'll be up in the range of a 15 GT or a used 11-12 GT-500. So, look at thoughts on upgrading this car or Upgrading to something a bit better? I know the 15 wont have the power, but it will be newer. I've seen a few 10-12 GT-500's for 38-42 K, that's do able. Just looking for opinions.