13: 1964 Porsche 904
Yes, we are mentioning a Porsche in this list. Before you get upset, the 904 is an iconic muscle car in its own right. Packing a powerful V8 engine and a track-designed body, the 904 is to this day one of the most exciting Porsches to drive. This car was designed at a time when Porsche was still a street-legal race car. The 904 is loud, fast, and very basic in terms of interior comforts, which is why many enthusiasts love it.
The car has a lot going for it and the values on these have gone through the roof. There were many interesting track cars to come out of Germany around this time period. The Porsche 904 is among one of the most highly sought-after additions, and for good reason.