based on experience, auto to manual conversion isnt complicated at all if the mechanic knows what he's doing. power wise a bit better but not by much. dont expect to get a tremendous gain of power. no stress when moving in a heavy traffic area cos auto tends to use higher gears even when the car is crawling and that makes the pick up suck big time. top end dont seem to improve a lot...maybe by mere 10-20km/h. fuel consumption got better. with auto i managed to clock 400km for RM50 of fuel (not at current rate of course) and after converting i got 500km. and the main satisfaction is the stress of over taking cars after slowing down is wayyyyyyyyyyy less.
parts that u need to convert a 4G92P from auto to manual are gearbox, drive shaft, pedals, gear stick, clutch, flywheel and pressure plate. thats just about all that u need. happy converting!