i've changed.
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got the Steelmate 898G and installed it without any problem. the car works fine, though i have to say that the wiring warranty is over since the car's wiring had undergone some modification.
the immobilizer still works, but i've disabled the whole immobilizer system to make way for remote start. if you're thinking of keeping the immobilizer, then the remote start have to go. choose either one, it's either remote start or immobilizer.
the alarm system is piggybacked on top of the original alarm. the original alarm still works, and i could still use the original Perodua remote to certain capabilities. so now the car basically have 2 alarm system on top of each other.
and not to mention remote start, temperature checking, a few kilometre reception, 2 way communication, car status check, engine disabling, starter disabling, fuel pump cut off, lock/unlock sound and yada yada.
the original Myvi alarm system sucks.
the immobilizer thingy does work, but most thiefs now brings their own ECU and swap the ECU and render the immobilizer system useless.