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I think they're worth it. I payed about $250 for my K&N CAI 63 series air charger. K&N claims 13.95 HP on they're website but I doubt you'll see all of that without a dyno tune to go with it. It's definitely louder at WOT, sounds like a giant vaccuum cleaner from hell trying to cave in your car hood from the inside out.
I'm not sure of the other brands, but I know on the K&N you never have to replace the filter. You just take it out and buy their 10 dollar recharger kit that contains a can of cleaner and a can of oil, follow the instructions, and put the filter back in. They are around 45 bucks to buy a new cone filter outright, but you don't have to do it.
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