Filter maintenance should be a non-issue. As well protected as the filters are behind the bumper, I'd wager they'll be just fine for a WHILE unless you drive around in the dust a lot.
Typically, you can't really FEEL a hp gain until its 7hp. Butt dyno won't detect any difference unless you gain at least 7hp. I'm sure you'll be able to feel 20hp. Just sayin...
Late,
Trav
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