LOL, I think I have heard the idea before, some stupid jokers were playing it in the other local forum :-D
Mate don't bother about any sorts of open pod air filter for NA engines, they don't work at all, all they do is to make your engine responding worse than in stock form. Though that is a different case in a turbocharged cars since the compressed air is hotter than the temperature of the air outside the pod.
Like many had suggested, try to find a K&N filter replacement, they would do better than stock no doubts. HKS sponge filter sucks, it sounds horrible and with the humid condition of Malaysia weather, you are more likely to see the sponge to actually worn out and could possible end up in your engine :-D
Either get a replacement filter, otherwise, if you really need to get an open pod filter (for cool factor :p), get those mesh filter from K&N, Blitz and etc.