Hi Wolfie,
Welcome to ZTH-MAC.
First advice for you is to get your car serviced.
> Oil Change
> ATF Oil Change
> Brake Fluid Change
> Power Steering Fluid Change
> Radiator Water Change
> Air Filter Change (advice to get K&N drop in)
> Plugs Change
> Timing Belt Change (bearing + water pump + other small belts)
> Aircond and Alternator Belt inspection/change.
> Tighten all the clamps
> Brake pads inspection/change
> Service aircond
> Ensure all electricals/bulbs running fine
Next stage is to get your car rectified if any problems presist.
> Radiator pipe if harden, change.
> All vacuums pipe if harden or cracked, change
> Engine mounting - if car vibrates, check mounting. Cracked? Change
> Absortbers if leaking, change
> Install a boost meter (at least)
Then only you think about adding power. YOu can start off with installing a manual boost controller. Depending on model, standard boost around 0.6 bar. If your car is healthy, you can increase it to 1 bar no problem. With that, you will get instant increase in power. It can be very obvious especially during boost when you compare 0.6 bar to 1 bar.
Of cos, that's basics. You wanna go more? Hahaha.. it's endless..... GOOD LUCK.
---------- Post added at 12:23 PM ---------- 6 hour anti-bump limit - Previous post was at 12:21 PM ----------
One more thing, lack of power could be due to leaking vacuum pipes. Turbo cars depends a lot on boost and vaccum, if it's leaking, you won't get power. And that is why I advise you to get your car back to good health before thinking to modify it. Those advised to change will set you back around RM5K already, including aborbers. engine mountings and brake pads.