where can i get supercharger or turbo for 500-1000?? hehe
i worked it out and to arrange and do a lot of the work myself it would cost atleast 2500-3000 to do a turbo. thats without a full ECU aswell.
for the EA, extractors might be the go. not sure how much power gain though, would be worth asking someone who has already performed this mod.
id imagine 5kw or so would not be unrealistic. so you would feel a bit more pull.
as for the rest of the exhuast.
the catalitic converter on cars is mounted around the middle of the car.
the exhuast goes like this from the engine: extractors, downpipe, piping, flexpipe(most of the time), more piping, cat, more piping, bended piping, 1 or 2 resonators in there somewhere, and finally the muffler and tip.
if you got a "sports exhaust" hopefully they gave you a cat back if not just a muffler. if its not loud enouph get them to take out the resonator which makes it quieter.
otherwise save the 350 and spend about 100 and get a full cold air induction/air filter kit which should give a few kw's and sound louder/better too.