I have aftermarket exhaust on my big bike, a full system, quite expensive. Not much (if any) gained power wise but save 4-5kg.
Lovely sound when opening it up but not so loud at lower rpms. I never tried removing the baffle, hmm.
Our scooters are always running original exhaust, I also hate extremely noisy scooters, what's the point?
Electrical bikes? They don't hear you coming, it's risky. Where do you charge it? Maybe okay for a small scooter type for running errands but for trips? No!
I am also not sure the batteries will last because of the tropical heat?