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VarioRam is a Porsche-patented engine induction system that was first introduced on the 1992 model year 964 Carrera RS motor sport special .. Porsche. Porsche. Porsche 964. It became standard on the 911-series starting from the M64 / 21 engine on the model year 1996 .. As the name suggests , VarioRam varies the effective length of the inlet ducting depending upon engine load and speed .. A long intake length at low rpm provides a better pulse tune because the pulse wo n't travel back and forth as many times , which aids low-end torque because the high pressure pulse may otherwise contribute to reversion and thereby decreased volumetric efficiency .. torque. torque. At higher engine rpm , the intake length is reduced .. The result is a flatter torque curve , with more torque available at low - and mid-range engine speeds compared to a similar non-VarioRam engine .. torque. torque