Eh reliable power in a 4 cylinder is a very debatable topic.
But if your looking for 400,
Turbo
1000cc or greater Injectors I personally recommend Injector Dynamics
TGV Deletes
Air Oil Separator
For heat soak purposes because your in the Philippines Id also recommend a Front Mount Intercooler. And as much heat isolation as you can get.
At least a Stage 2 clutch, something with a 80% above stock clamping load.
Stick with a stock flywheel, lightweight flywheels tend to cause idle issues during tuning.
I would also do tubular headers and Uppipe, your choice in either equal or unequal. Honestly unless the car is a dyno Queen and chasing numbers the debate of UEL vs EL headers is a moot point, it all comes down to personal preference by then.
If you don't already have it by now, upgraded fuel pump, I recommend the aeromotive 340LPH. Id also do the air pump delete on it as well, not a huge horsepower gain, but it makes for less weight and less engine bay clutter for running IC pipes.