JR who are the top 10 worst tuners here in the USA?

You need to define "tuners" for some shops who sell, install or repair call themselves that and then there are those like me who really "tune" the engine managemnet for best functional performance.

I guess I mean which "shops" that call themselves tuners, like most people would see on the larger forums, have had the least customer satisfaction & destroyed the most cars?

Just look at the vendors listed in this section and you kinda see who some of the worst are as no vendor is listed here until I have personally seen their lack of quality products or work on several different cars.