Yes and Yes. If the unrestricted breathing gets to you, Turn up the radio or get a cat back system. Or you could give up the 11-15 hp and go back to the stock filters.
The sound of more power, even if it's only 10hp, is never annoying to me. You should hear one of Doug Levin's supercharged Vipers. Now THAT'S HISSING!!!
The K&N high flow air filters sound near the same. The only "fix" I can offer is a set of S&B's with the pre-filter. They sent me a few air filters with a foam pre-filter attached, much like the stock ones, but thinner and not as dense. That "may" quiet it up a bit if it's annoying you. Let me know if I can help further.
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