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Photo: Bring a Trailer/autoevolution

Ford then went on to build several amazing versions of the S550 Mustang, such as the Bullitt, the Mach 1, and the Shelby-branded GT350 and GT500. The latter two can be considered collectibles if you can find a low-mileage example today and put it in storage.

Speaking of Shelby, or Shelby American to be precise, their take on the S550 Mustang GT is quite amazing. The tuner built a bunch of limited-edition Signature Series cars a while back, sending them out to dealerships across North America with 825 horsepower at their disposal. Only 50 of these cars exist today, and we just found a stunning convertible model getting auctioned off to the highest bidder.

It’s finished in Race Red with a black soft top and white vinyl racing stripes, plus matching lower door graphics with Shelby lettering. Other visual highlights include the wider fenders for a more planted stance, a dual-intake ram air hood, a front splitter, revised fascias, carbon fiber mirror caps, a rear spoiler, Shelby-branded taillight panel, plus a set of 20×11” forged alloy wheels with Michelin Pilot Sport Cup 2 tires.

Meanwhile, the Carroll Shelby Signature Series package adds the Performance Track Handling suspension, as well as Brembo brakes with six-piston calipers at the front, four-piston ones at the rear.

The interior hasn’t been left alone either, featuring black Katzkin leather with perforated inserts on the heated, cooled, and power-adjustable front bucket seats, to go with white contrast stitching and special embroidery for the backrests. Other features include the custom light bar, adaptive cruise control, dual-zone automatic climate control, a 12-speaker Bang & Olufsen sound system, an 8” touchscreen for the SYNC 3 infotainment system, and auxiliary gauges for boost pressure, fuel pressure and oil temperature.

Also, there’s a special dashboard plaque that identifies this as a Signature Edition Mustang, no. 16 of 50.

As for the power unit, it’s Ford’s trusted 5.0-liter Coyote V8, albeit modified to within an inch of its life. It now boasts a polished Whipple supercharger, an aluminum heat exchanger, billet throttle body, custom air intake, high-performance fuel injectors, plus a revised radiator and coolant overflow tank. The latter two are part of the Shelby Extreme Cooling System.

Altogether, this car is putting down 825 horsepower, with everything going to the rear wheels via a 10-speed automatic gearbox.

How much did this originally cost? Well, the Mustang GT donor vehicle was a $60,150 affair, while the Signature Edition Package retailed for $76,695. Overall, you’re looking at a $136,845 Mustang – and if you hurry up, you might just be able to purchase it for a heck of a lot less.