Mazda RX7

The Mazda RX7 is a unique car in that it has the rotary engine. People argue that the rotary is very fuel inefficient, but the fact is, and there is no denying, that the engine has power even greater than other much larger engines which have the same fuel efficiency. RX7s of all generations have had good engines which deliver turbine smooth power and excellent throttle response. The latest generation RX7 is remarkable in having the excellent FD3S engine.
 

The twin turbo is special in that it is a sequential setup. (not that it is the only car with it, but it is one of the first to incorporate this technology). The difference is that both the turbochargers are not producing boost at the same time. Turbochargers run on exhaust gases which turn the turbine. If there is not enough exhaust gas to turn the turbo then no boost is produced. This is called turbo lag. Large capacity turbos will have more turbo lag than small capacity turbochargers because the turbine is bigger and more massive and requires more exhaust gas to turn it.
The idea of a sequential twin-turbo is to overcome this turbo lag by have one large turbo and a smaller turbo. At low engine speeds, the small turbo will spin to produce low rpm boost and torque. At about 4000 rpm, the system switches to the large turbo to provide high pressure, high end horsepower.

This all results in astonishing performance and a 0-100 km/h time of only 4.9 seconds!! The sequential turbo setup is however, a drawback in modifying the RX7 as certain aspects of modification can affect the system so that there is a "gap", when neither of the turbos are spinning.
The advantage of the RX7 over other performance cars is mainly the engine. The small engine block means weight is saved. And big power + light-weight = awesome performance. This is obvious.
But what might not be so obvious, is how this affects the handling of the car. The weight distribution of the RX7 is near perfect (perfect being front: rear, 50:50), because of this light weight. Many cars are criticized as being 'nose- heavy' which often causes cars to understeer. The RX7 is great for both straight line speed AND windy roads.