Good luck with a response. You are responding to a 7 year old thread, although the OP last logged on the forum in September
To answer your questions ... yes, there are hp and torque gains, but they are minimal. You're looking at about a 3-4% max gain in hp over a fully stock engine - I doubt your butt dyno is that sensitive. And if you have other bolt-on mods, the % gain is even less.
Yes, they are easy to clean. Some warm water and diluted simple green cleaner should do the trick. Obviously, make sure they are
completely dry before reinstalling. I've seen a few posts online over the years saying the the HKS foam filters need to be oiled occasionally (see quote below). I've haven't looked into it too much, though, as I prefer and use dry filters.
Quote:
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Originally Posted by Nicoclub Forum
the foam filters should be oiled with a tackier oil than the gauze filters like kn's, so if you can find monster flow oil, true flow oil, or actual hks filter oil then go with those
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