Should I leave it Stock?
Not in my dictionary. It's only original once, but, it can be stock any number of times if you return it to that state. I wouldn't hesitate to customize the car as long as it's bolt-on stuff. You can always pull the aftermarket parts off and put the stock parts back on if you plan to show or sell it. Even cutting and welding can be undone if proper methods are used. It's just expensive to do.
