You have an old school mentality I'm afraid. Most people modify their cars now, especially mustang owners. My dad feels the exact same way; that the car how it looks and performs from the factory is the absolute best and shouldn't be changed. He even goes so far as to tell me that if you modify your car your not happy with it and your stupid for buying it. Different strokes for different folks. He drives a base 2010 camaro and hasn't done one mod to it. I think he might just be a little jealous
I'll put it this way: my 2011 GT/CS stock looked and ran great, now, with the mods I've done it looks like a beast, runs even better and stands out from the rest!