Never heard of them, one of the best Mustang tuners in the US is JDM in New Jersey, but it is not these guys. I do not see any other mention of the Mustang on the page besides the very top. Even if they are legit, and assuming it would fit, I am sure it does not come with a tune. The fact that it says "Universal Starter Turbo Piping Kit" is probably not a good sign either. I would take that to mean, "here are some pipes, see if you can make this work on your car, whatever that may be." I would steer clear of this one.