So, if I got this right, some say that I should keep the car stock, for resale value, and some recommend to modify it.
I am faced with a show stopper, and for now, I have to keep it stock. So that you know, I convinced my wive that, the last production of Boss cars was in 69-70, and that it would be a great thing to get the 13 Boss in case Ford decides to turn off the production valve. The condition was that I would no longer spend money on my 2000 GT ($11,000 in 2011) and get the Boss, which has everything needed on it (no additional spending). I agreed, but I keep looking at the flowmaster pipes (which connect to the side pipes) and better looking wheels. Like some of you, I also convinced the wife that this was an investment, that will pay off in about 25-30 years (I suspect if it stays stock), so I appreciated the comment of keeping all the original parts.
I think that my best bet would be to wait a few years, change the exhaust system, but keep the original for resale value. We will ride the car to shows and enjoy it a bit before winter storage every year. I don't think I will be racing it, so no change in the shifter, suspension, or drive shaft needed. By the way, because we are getting older, we decided to go with the standards seats, but tinted the windows in a dark black. It looks great on a SBYBoss.