Roush is listed as manufacturer and no the warranty for Roush vehicles are not from Ford they are given from Roush.
They are similar to RUF for Porsche or Alpina for BMW.
Ford Roush Mustang 415 specs
|Origin country||United States|
|Engine type||Supercharged v8|
|Displacement||4.6 l (281 ci)|
|Power||421 ps (415 bhp / 309 kw)|
|Torque||522 Nm (385 lb-ft)|
|Power / liter||91 ps (90 hp)|
|Layout||front engine, rear wheel drive|