You could get the Japanese parts, but it would be problematic getting the ECU if your car is OBDII. Without the ECU for the high revs, you're probably looking at a tiny boost in power only. Something that could be matched with some simple IHE and management mods.
For the cost of everything, it might actually be simpler to swap in a bigger motor. That'd give you both more power and more torque. A high-revving 1.5 is fun and all that, but for a daily driver, a 1.8 liter engine with similar power and more torque will definitely be more enjoyable.