A series of Mustang Dark Horse–based test mules are running around Dearborn, sporting changes that hint at the impending ...

Even with those added costs, the Roush Stage 3 Mustang should slip nicely between the Boss 302 and GT500’s respective $42,200 and $59,200 price tags, which is fitting for the upgrades it offers.

The workhorse probably boasts more power than stock, but is that enough to put the mighty muscle car in its corner down the 1 ...