There are several trim levels for the fastback: EcoBoost and EcoBoost Premium, GT and GT Premium, GT350 and GT350R. The convertibles simplify things by only offering EcoBoost, EcoBoost Premium and GT Premium trims.
The EcoBoost Mustang's standard equipment includes 18-inch wheels, a 4-way manual adjustable driver's seat, 50/50 split-folding rear seat, a 6-speaker sound system, the SYNC 3 infotainment system, active noise cancellation and an "intelligent" key.
The EcoBoost Premium trim adds dual-zone automatic climate control, heated mirrors, additional exterior lighting, heated and cooled leather front seats with six-way power-adjustability for the driver, and a 9-speaker stereo with SiriusXM satellite radio compatibility.
The Mustang GT and GT Premium come similarly equipped to the EcoBoost trims, though of course GT models are powered by the fire-breathing 5.0 V8 engines rather than the fuel-sipping four-cylinder turbo. Several performance options and packages are available, including a range of rear axle ratios, several wheel choices, and Recaro sport seats. A California Special Package adds 19-inch ebony wheels, ebony suede seat inserts with red stitching, special door panel inserts, an aluminum dashboard finish and more.
The Shelby GT350 and GT350R variants use a special flat-plane crankshaft that allows its big V8 engine to rev to over 8,000 rpm. It's a special engine, using technology normally found in high-end supercars. Usually, a larger V8 means lots of torque lower in the rev range, but a compromised ability to make power at higher rpm. With the Shelby GT350, there are no such compromises. The GT350 also has standard magnetic shocks, a more aggressive exterior package and various interior badges.
Mustang packages include a Performance Package, for both the EcoBoost and GT. It offers a Torsen limited-slip differential, 19-inch wheels, an engine-turned aluminum instrument panel, gauge pack, heavy-duty front springs and larger brakes, a bigger radiator, and unique chassis tuning. The Pony Package adds different 19-inch wheels, unique upper grille and Pony logo, a side stripe and bright trim at the beltline and around the window. Finally, the Premium Plus Package upgrades Premium trim Mustangs with color-accented leather seats, a heated steering wheel, a 12-inch LCD digital display, a center console with hand stitching and more.