Not that I care about the value of my car, which I really don't. It's something I enjoy like a large toy or hobby and that is all. It's great that it's worth more than what I paid for it, but if it was practically worthless and I couldn't sell it for even $50,000, it simply would not matter to me.
With that being said, anyone that thinks a bone stock FGT will be worth more than one with at least some or all the options that Ford Racing officially offered like the short shifter & knob, rear exit headers (or at least one of the exhaust combinations), optional light weight wheels, tranny cooler, etc., is out to lunch. There is nothing wrong with keeping a car bone stock or adding hairy pink seats to it, but saying that you’re not modifying your car to “preserve the factory bone stock collectibility” just isn’t accurate thinking in my opinion. If that is your goal, then you better go out and get these mods done before they aren’t available, because I can guarantee you that one with all the Ford Racing mods will be worth 3 times as much as one without them in 30 years. Look at practically any other vintage car from 30 years ago and you’ll see what’s coming for value in your FGT in the future. It’s quite simple really.
I likely have more mods than just about anyone out there. I have tried to do them in the spirit of the vehicle, and as a side benefit some are going to increase the car’s value, but I did not do them for that reason alone. I did them for the hobby and the fun of it, the value increase is just an added bonus.