abstract:Twin Clutch SST (Sport- or Sportronic Shift Transmission) is the brand name of a six-speed dual clutch transmission developed by Getrag for Mitsubishi Motors."Transmission - Twin-Clutch Gearbox", Autozine Technical School"SS-T: The Magic Inside the Evo X", The Motor Report, April 14, 2008 The system was first incorporated in the 2007 Lancer Evolution X, and was designed to be a more performance-oriented system than that developed by rival manufacturers,"Technical Analysis: Twin-Clutch Sportronic Shift Transmission", Shaun Bailey, Road & Track, March 2008 with shorter gear ratios optimized for acceleration.