SCT Performance’s Matt Alderman was kind enough to demonstrate the new X4 for us on his modified ’14 Mustang GT. He assures us that he’s not trying to imitate a Shelby by adding the grille.

To see how much an off-the-shelf tune could help our 2008 GT, we ordered Superchips' new Flashpaq programmer, which offers built-in tunes for 87- and 91-octane fuel. Not only does the Flashpaq ...