There are certain cars that should be left untouched, but apparently, the owner of this 1966 Ford Mustang decided otherwise. Not long ago, we shared with you what could be described as the worst modified Jaguar E-Type. While the Mustang is far easier on the eyes (or, at least, less disturbing), it would still cause some purists to fall off their chairs, as this classic pony car has been transformed into a one-of-a-kind, open-top speedster.

We are not sure whether the 1966 Mustang started out as a notchback or a fastback, but as you can see, the whole roof has been completely removed. The A-pillar and windshield have been chopped as well, leaving only a small section of them. All the side windows have also been removed, exposing occupants to the elements. The rear section of the interior has been covered by a bespoke body panel with integrated cowls.

The creator of the Mustang Speedster has also gone to great lengths in order to give the one-off car Shelby aesthetics. It features what is known as Mustang Plus Ronster body kit, 17-inch wheels, Shelby front hood and side scoops, taillight panel, rear spoiler, front splitter, and a dual-exhaust. The Mustang Speedster is finished in Sonic Blue Pearl with white racing stripes and GT350 inscriptions}.

The interior consists of a simplified version of the original 1966 dashboard with a centrally-positioned speedometer and black-leather bucket seats. There’s also an aftermarket, three-spoke steering wheel, four speakers, and JVC AM/FM CD stereo. The stock center console and shifter for the three-speed automatic have been kept in their original form.

Under the hood resides a replacement 302 cubic-inch Windsor V-8. No modifications have been listed, other than the obvious Cobra-branded air cleaner and valve covers. While the302 Windsor is known to respond well to modifications, a stock one produces a not very impressive 205 horsepower (in later versions).

With such output, the one-off speedster is more for show rather than performance, but it’s certainly unique. The car was recently auctioned off on Bring a Trailer, for $22,500, which is slightly lower than the $24,000 it sold when it was last listed. While, arguably, not the best investment, it's a small price to pay if unique is what you are after.