someone has an entire list of dealers across the country and descriptions of their service be it good or bad. hopefully someone can post it up for ya, i don't have it....but it is out there
Ive asked the Head Reps of the two big SVT Dealers on Long Island, NY about mods.
Here is what they told me: "Throw a catback on and be done with it., Keep everything to exact ford specs, even the oil. And you dont have to worry about anything."