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  #13  
Old 09-27-2011, 02:03 PM
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Re: Worth dropping in a K&N filter for the 5.7?

This debate has been going on for ages.

If you over oil a K&N it can cause some problems, but otherwise it is a fine filter.

Never heard of engines being damaged by dirt that gets by the filter, but again over oiling is a problem.

If your air filter is constricting your intake airflow the K&N should make a performance and economy improvement, however Jeep has done a pretty good job with the intake for the Hemi, and I doubt there is a lot of restriction to overcome.

Ecology oriented people like the idea the filter can be cleaned and re-oiled over and over again, for the life of the vehicle. Economy people will like the fact they never need to buy an expensive filter again. (but do need to buy the cleaning kit).

Many people buy it just because you can then hear your intake, and that alone makes your Jeep feel faster.

Is it worth it? Only you can deside if it is worth it to you.
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Old 09-29-2011, 04:22 PM
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Re: Worth dropping in a K&N filter for the 5.7?

Thumbs up, worth $50 no doubt. Improved throttle response and reduce a bit of the flat spot below 3,000 rpm on the hemi.
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Old 09-29-2011, 04:52 PM
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Re: Worth dropping in a K&N filter for the 5.7?

Noticeable improvement on my 5.7 wk2. Have always used them.The idea is that they are more highly engineered then the oem stuff. They can flow more WITHOUT sacrificing filtration capability. I believe this has something to do with the oil.
I have never oiled one. Just take them out once in a while and vacuum them with a good shop vac. Tend not to keep vehicles but have done this for max of about 50,000 mi. Great sound as well, not obnoxious or annoying.
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  #16  
Old 10-02-2011, 09:37 PM
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Re: Worth dropping in a K&N filter for the 5.7?

K&N does increase power by <5 horses, but that 1% is not noticable on a 360 HP engine. I could not feel extra power on my 275 HP '90 Corvette until I added about 25 HP with a high-performance chip. But the car can breathe deeped when needed.
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  #17  
Old 10-06-2011, 05:22 PM
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Re: Worth dropping in a K&N filter for the 5.7?

It's worth it if you figure a one time cost of 50 bucks for k&n or 25 bucks for a paper filter every 3 to 6 thousand miles. That paper filter costs you between $500.00 and $1000.00 if you keep the car for 120,000 miles. I just wish they made a washable one for the cabin air filter.
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  #18  
Old 10-06-2011, 05:41 PM
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Re: Worth dropping in a K&N filter for the 5.7?

Quote:
Originally Posted by WK2 Rover View Post
K&N does increase power by <5 horses, but that 1% is not noticable on a 360 HP engine. I could not feel extra power on my 275 HP '90 Corvette until I added about 25 HP with a high-performance chip. But the car can breathe deeped when needed.
Thank you.

Everyone I know that have powerful cars do not notice a difference after adding a cold air intake.

Others with smaller engines and less HP did notice a difference.
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  #19  
Old 11-27-2011, 06:28 PM
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Re: Worth dropping in a K&N filter for the 5.7?

I've always put K&N filter elements in my cars, but from what I'm reading these days, the stock filter performs just as well and keeps more dirt out!
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Old 12-02-2011, 01:34 PM
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Re: Worth dropping in a K&N filter for the 5.7?

why not get the volant? it uses a dry element air filter that's warranted for 100k miles. No oil issue and a lot higher flow. Best of all worlds. Plus it sounds great. If you're considering a ported TB, you want the highest flow possible
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Old 12-02-2011, 06:23 PM
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Re: Worth dropping in a K&N filter for the 5.7?

Quote:
Originally Posted by fotomatt1 View Post
I've always put K&N filter elements in my cars, but from what I'm reading these days, the stock filter performs just as well and keeps more dirt out!
The K&N is washable, that equals less money spent in the long run.
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