I currently have a 2010 GT500 with some power/suspension modifications (see sig). I plan on pushing around 650-700whp with power and supporting driveline/suspension modifications over the next year or two, and love the prospect of building it up myself. However, recently I have come across a few low-mileage 2013s that are slightly outside of or within an acceptable price range for me. The main question is, are the '13s that huge of an upgrade to warrant the jump from my '10 at the numbers I plan on being at? I know the main differences but I'd like '13/14 owners to chime in on mod-ability and driving performance. I've driven a 2013 and honestly wasn't blown away, but then again 662hp on street tires at 45 degrees isn't a fair test. Any input would be great, thanks guys.