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Porsche Cayman Turbo Returns to the Ring? Another viewpoint is what will happen to the next generation BMW Z4M coupe. The rumor is there will be a uprated version (about 350hp)of the current 3.0L I6 TT used by the 330i. Current Cayman engine is 3.4L. With twin-turbo, theoretical minimal output should be 100hp/L (i.e. 340hp). Combine that with direct injection, which has both horsepower and fuel saving properties. In the future, with higher strength material, 120hp/L for TT should bethe norm. Also, Cayman engine displacement will be increased with Carrera's engine size increases.