1974 3.0 RS

Far rarer than the 2.7 RS (just 109 were built, of which six were right-hand drive), the 1974 3.0-litre RS achieved featherlight status through the adoption of every weight-saving measure Porsche could think of at the time: think magnesium engine casings, glass fibre body panels, ultra-thin glass and the deletion of every possible option. Now intensely collectable, expect seven-figure sales of the 3.0-litre RS.