In 1978, Citroën released the first Visas, as small ecomony cars. But just as Ford released the XR2, XR3, and XR4x4 ranges, and Vauxhall released the GTE ranges, it was inevitable that this small, lightweight car was going to be the focal point for Citroën's exercise in producing a performance "hot hatch". The ball started rolling with the 1360cc GT model, which came in the form of the 14 TRS, the Chrono, and the Tonic, putting out 80Hp. This was later removed from the manufacturing list and replaced by the GTi, which came in two forms: the ch105, and the ch115. The difference being the ch105 put out 105Hp, whilst the ch115 put out 115Hp due to larger valves.
With a 1580cc fuel intected engine, and over-head cam, almost identical to the one in the Peugeot 205 1.6 GTi, you had acceleration that would take you from 0 - 60mph (0 - 100 kmph) in 8.8 seconds, and stick to the road like glue when it did it. The body was skirted by a moulded plastic trim, and the car was lowered to give it more stability, as well as having wider, semi-low profile tyres (185/60/13) on alloy wheels, and four halogen headlights as standard.
Production, unfortunately, ceased in 1987, and this means that some parts are hard to get hold of, but generally, the engine parts are the same as the Peugeot 205 GTi parts, whilst the trim is still built and fitted to the C15. Panels you may well have more trouble with, and generally they have to be brought from France to wherever you are, which can push the price up.