Karamihan, pero siguro meron din diyan orig. Kaso lang nga, di pa ako nakakita at probably virtually impossible to differentiate based on looks alone. Ganun kagaling ang mga taga-China.
Simota ay ang least-expensive-na-may-brandname option. Meron pa mas mura pero walang brand. (Check Blade.

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Marami naman nakakabit na ng Simota, kaso wala ka siguro mababasa na actual reviews sa net. Meron ako dati nakita youtube video lang ng tunog ng Simota. Taiwan company sya, iirc. Pero intake lang yan, at its own, walang malaking change yan. Many would say Simota would suffice. Some others would claim that better intakes would give a difference experience. Your choice, I guess.
Ang kasamang filter element ng simota, usually HKS copy nakikita ko, aka foam type. Disposable lang rin yan. Pwede mo palitan ng ibang filter element like K&N, AEM, aFE, etc basta alam mo yung diameter ng intake tube at kasya yung filter element sa loob ng bay.