A while back, Shelby introduced the Carroll Shelby Signature Edition package for the Ford Mustang. The bundle turned the regular Mustang GT into a more aggressive pony design-wise and replaced the standard V-8 with a supercharged unit capable of 825 horsepower. Now, Shelby is extending the Signature Edition to the GT350 and GT500 models. These new packages are much thinner on the performance front, but they're also notably more affordable. The Signature Edition is available on the 2020 Shelby GT500 and 2015-to-2020 Shelby GT350 models, including the GT350R. Like all Shelby conversions, every Signature Edition car will receive a Shelby CSM number and will be documented in the official Shelby American Registry.

The Shelby Signature Edition adds goodies inside and out

The latter will get just a couple of extra features on the outside. There's a spoiler for the trunk, signature side skirt stripes with "Shelby" lettering, and a set of 19-inch, one-piece, forged wheels. Inside the cabin, Shelby adds leather seat covers and serial number badges. There's also billet engine caps under the hood. Optionally, you can get the widebody kit, painted stripes, a rear seat delete, an aluminum coolant tank, a short-throw shifter, and a dry carbon-fiber hood. You can also equip the coupe with Michelin Sport Cup 2 performance tires.

Moving over to the GT500SE, it comes with the carbon-fiber, ventilated engine hood standard, as well as hood struts and locks. The bundle also includes the billet engine caps, leather seat covers, and CSM plates, but Shelby adds the stripes and the badges at no additional cost. The GT500's options list is similar to the GT350SE, minus the features that are included as standard.

The Shelby Signature Edition adds more oomph to the Mustang GT500

Performance-wise, only the GT500 gets more power. The GT350SE remains the same under the hood with the 5.2-liter V-8 rated at the factory-stock 526 horsepower. However, it comes with extras that improve its agility on both the road and the track, including caster camber plates, Shelby sprints, and sway bars, as well as performance-spec tires (not as grippy as the optional Michelin rubber).

That's 40 horses more than the standard Mustang GT500. It also features the springs, sway bars, and caster camber plates from the GT350, but Shelby includes a handful of extras. You'll get performance half shafts, high-volume intercooler and heat exchanger for the supercharger, a recalibrated suspension, and bigger 20-inch wheels.

Production of the Signature Edition will be limited to 100 units per year. Buyers of the first 15 examples will benefit from a First 15 package that includes an invitation to a special party in Las Vegas, an autographed photo of their car at the Shelby headquarters, one of the first 15 Shelby serial numbers, official Shelby gear, and one night's stay at the D Las Vegas Casino and Hotel to visit Shelby American.

The sale of each Signature Edition car will benefit the Carroll Shelby Foundation. Established by Carroll Shelby himself, it provides medical assistance for those in need, educational opportunities for young people through automotive and other training programs.

FAQ

Q: How much does the Shelby Signature Edition package cost?

The GT350SE upgrade is by far the most affordable, coming in at $9,995. The Mustang Shelby GT350 starts from $60,440, so the upgrade will set you back $70,435 before options. That's $2,500 less than the stock Mustang Shelby GT500. If you want to upgrade the GT350R, it starts from $73,435, so the Signature Edition will cost $83,430 before options.

Because it adds more features and extra oomph, the Signature Edition package for the Shelby GT500 costs notably more at $29,995. With the Shelby GT500 priced from $72,900, the whole deal will cost you $102,895 before options. While this is far from cheap, it's still more affordable than Shelby's 825-horsepower Signature Series Mustang, priced from a whopping $127,795.