The real deal will be top of the six-cylinder sportscar pecking order, of that we are sure. However, Porsche will not let slip how it gets there. At the GT4's core will be a boxer engine, though which one remains a closely guarded secret. The Cayman GTS puts down 340 hp, so if the 3.4-liter is kept, expect a boost to at least 355 hp.
However, tuners like Ruf have shown that fitting the 400 hp 3.8-liter engine from the Carrera S into the engine bay of a Cayman or Boxster is possible. For us, that would be the ultimate Stuttgart sportscar, but it might not be what's coming our way. Other reports suggest a turbo engine is to be used, though they seem unlikely to materialize.
As for the design, expect a massive rear wing to sprout over the engine deck. It will impede visibility though the rear window. But as everybody knows, cars in the rear mirror are losing. A more aggressive front bumper with a carbon splitter, lowered suspension and a carbon fiber rear diffuser flanking twin exhaust pipes will all be added.
GT4 prototypes that have so far been spotted appear to have red brake calipers, indicative of normal steel discs. This could either be because carbon ceramics will be optionally added or because steel brakes have better pedal feel.