If u want a nice ride, Modify it.
If u want a fast car, Turbo-Charge it.
If u want a larger car, change the engine.
There's no such thing in the world where an ECU be it Motec or Microtech or Hondata and or any other piggy-bag (E-manage, OBit, Unichip) can give a car more than 30% increase in Horses needless to say 100hp.
Automatic transmission cars contains no clutch engagement, thus u can never ever smell 'the clutch smell' when u rev it high; certainly not with a Nissan Cefiro.
No car in the world can be lowered by two gears when engaging in a speed of 240km/h and this applies to Evo as well be it a Evo6.5 or whatever limited Edition model, the clutch and gear can never take such intensity.
In GoD we Trust.