The Fox Body Mustang is becoming an increasingly popular platform for restoration and resto-modding, and it's easy to see why. It offers timeless style at an affordable price point. The Fox platform also has enormous performance potential for those of us who love to go fast. The 5.0L V8 and Borg-Warner 5-speed manual that came with this 1989 Mustang GT are a great starting point for tuning, but owner Gabe Flores — the Brand Manager here at Classic Industries — wanted performance on par with modern-day muscle cars. So, he teamed up with Mustang Hub Magazine and American Powertrain to install a Tremec TKX transmission that can hold even more power than the stock Borg-Warner T5.