Sting For Your 1986-93 'Stang Get more power from your 5.0L pony with Flowtech's Stinger Cat-Back system. This system will boost horsepower, increase performance and even help improve fuel economy. Easily installed in the stock location, the system includes mandrel-bent, 2.5'' flow tubes, 2.5'' Warlock mufflers, turndowns and all mounting hardware. Fits 5.0L Mustang GT/LX. 50-State Legal.