+1.
In my experience of cars, its always much easier to sell a stock car than one which has been modified - you are hitting a much wider market.
+2
I had an extemely modified 350z and it took about 1 and half months to sell my zed and because it was so unique it narrowed the market. Whatever I do to my 370z... I shall make sure I keep all my oem parts and it will go back to stock when its time to sell