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in my 99 f150 w/ the 4.2 v6, i saw an increase of about 5mpg and and a notable gain in power...i used to sell them for a living and one of the best examples i saw was a dirty k&n filter will out preform a clean paper filter. in time, the k&n filter will pay for itself, think about it, a k&n will run u about 50-60 bucks a pop. a paper filter will cost u anywhere about 8-15 dollars if u've got a common one...so if u do the math and actually replace ur paper filter when ur supposed to, then it's easy to see the filter is a good idea.
u will have to clean them now and again and re-oil them but recharge kits are about 10 bucks and i've yet to use one on mine w/ about 30k on it...i shake the debris off of it now and again tho, but that comes with living in NE
in my opinion, if ur planning on keeping the vehicle for an extended period of time, then u can't really go wrong w/ a k&n.
I have a K&N in my 300. If you get one, get it from autoanything.com. They're well priced (about $15 less than auto stores) and I think free or very low shipping.
As for gains, I noticed about 1/2 - 1mpg increase and a little extra pick me up. It all adds up in the end, especially since you never have to replace it. After 5 regular air filters, you've already paid it off.
sorry bud, i'm not buying it, everything i've seen or experienced w/ it points to good investment imo...but like i say, it's all just opinion and u'll never kno until u try, right?
as long as u keep them oiled there shouldn't be any problem. fact is, more air flow = more power every time and a paper filter, clean or dirty simply can't allow the same flow a KN does. there's nothing biased about the facts on this, and i'll check out wat ur lookin at, but wat i've seen is that even a dirty KN will out preform a clean paper filter every time.
I thought I read somewhere that the oil in K&N and other similar filters was causing damage to MAF sensors located downstream...anyone else hear/read this anywhere?
i'm gonna have to agree... i've run k&n filters on some of my vehicles, and they never really did anything that k&n claims, and they weren't worth the money. i'd rather replace a paper filter every 10K miles instead of having to oil and clean a k&n filter, not to mention the worthless open cone filters that run for $200 and catch bugs like no other.
I have three used K&N filters (about 20 to 30 K miles) and a bottle of the oil that I would love to get rid of as they are taking space in my garage. Was nice for a while, but reoiling is an art and I am not an artist. Besides I doubt it gave any power advantage on my I6, maybe the Aerostar as it would rev to 5700 WOT.