Wala yatang catalytic converter yung local ESi... but I might be wrong, as the US version has one. Check what it looks like inside. Cats have a mesh covering the inlet, while resonators are straight through.

If your engine is in good condition, it should be okay. My car is running catless and it's far, far below allowable hydrocarbon emissions for 2003 and up vehicles (according to LTO standards) and still within Euro standards (although I can't find exact conversions).

Honda's small engines were originally conceived to pass previous emissions requirements without cats, so as long as it's in good tune, with no sensor, spark plug or compression problems, it should be okay.

Of course, the easiest solution is to buy a high-flow cat. BUt that's expensive.