K&N Air Filter Nob Questions

Hey Guys,

 

Nob question, if I install a K&N air filter do I need a tune?

No, although you'll have to be pretty diligent of cleaning your mass airflow sensor if any issues crop up. Excess oil from the filter could get sprayed onto it.

Go with the AEM Dry filter if you want a reusable filter

 

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the person (s) that invented K&N original oily filters needs to be tarred and feathered.

 

such never actually get clean as you can't get 100% of the fine dust off it.

 

and all they are is something to hurt your car.

 

20 years ago I watched a mechanic swapping a 318 out of a dodge truck.

...starved for air by a K&N.

Yeah, heavily recommend using the AEM DryFlow since it's oil free and washable. Google the part # 28-20304 to find the one for 5th gens.

I was hoping this was a thread of people saying not to get the K&N. Not only is the oil an issue, mine didn't seal properly. An Outback member had the same problem. Checked the filter 10k miles later and dust was seeping around the bottom of the filter.

Oh but to answer your actual question, you don't need a tune for a drop-in filter

Oh but to answer your actual question, you don't need a tune for a drop-in filter

 

Technically...you should get it tuned. Because why buy a $50 filter if you aren't willing to drop $400 on a tune too!

 

edit-.../sarcasm you don't need a tune unless your datalogging tells you one is needed.

Several people ove here in Oz have had issues over the years with oil on the AMS, screwing their air flow data and hence the tune, resulting in bad running.

Good tuners avoid them.

 

Add to the fact that, well the ain't no free lunch - the "greater airflow", well at least initially, is from having bigger holes in the filter that allow small fines to get through, polluting your engine oil and wearing your bores and bearings.

And when they get dirty, they flow worse than factory paper filters.

Thanks everyone, I had ordered the AEM one but got the K&N one shipped so I was debating sending it back or keeping it but you guys helped solidify my initial thoughts send it back and go with the AEM dry.

 

Thanks

Can anyone confirm if the AEM Performance Air Filter 28-20304 will fit in a 2011 leg n/a?

Can anyone confirm if the AEM Performance Air Filter 28-20304 will fit in a 2011 leg n/a?

 

Summit says yes and I trust them. https://www.summitracing.com/search/year/2011/make/subaru/model/legacy/department/air-fuel-delivery/part-type/air-filter-elements?N=4294949824%2B4294936734%2B4294934745%2B4294951509%2B4294949616&SortBy=Default&SortOrder=Ascending

just use the sock filters and change ever 15K or as needed

Another good filter is the Blitz SUS Performance LM . I got it for my 2014 leg and love it so far, similar to the AEM one it's reusable and doesn't have any oils, it's also made of cotton which supposedly is better quality. I recommend it.

What's wrong with standard equiv. paper filter?

What's wrong with standard equiv. paper filter?

 

Absolutely nothing.

 

I buy in bulk since my O.B. & Legacy take the same one and replace them annually.

Have a K&N in the box after I tired of cleaning the MAF. Stock panel filters are fine... Change on the regular and fit perfect.

*quietly ordering the dry filter and removing the K&N one without anyone noticing

 

Any reason to think the K&N cabin filter is equally as not recommended? Only negatives I saw on that was due to the oils it had a manufactured scent for the first couple of weeks.

*quietly ordering the dry filter and removing the K&N one without anyone noticing

 

Any reason to think the K&N cabin filter is equally as not recommended? Only negatives I saw on that was due to the oils it had a manufactured scent for the first couple of weeks.

 

 

 

Some people claim that the filter lets larger particles through than paper filters or washable dry media filters. I’ve yet to see any data on that, but it is what they say.

 

Me personally? I’ve had K&N or similar oiled gauze filters on four cars. Two of them seemed to be a little peppier with them and suffered no ill effects for years. One it made no difference at all. The fourth had an aFe cone filter that dripped oil — over the course of more than a decade — onto a hose below the airbox and wrecked it. I replaced it with a newer model aFe dry filter and didn’t look back. I don’t know if it made a performance difference because the car came like that. I didn’t have MAF or intake fouling on any of the cars because I was careful not to over-oil the filters.

 

If you’re not replacing the intake to let more noise out — seems like most intakes do nothing or even reduce performance — you’re better off just using a quality paper filter and replacing it regularly.

 

 

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I’ve got a new K&N filter meant for an older (2003?) Legacy 2.5GT in the box just lying around. I assume it’ll work in anything with an EJ253 in it.

 

Free to a good home. Assuming you consider “in your airbox” a good home for it. [emoji23]

 

 

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To offer an opposing view, I've had a K&N filter in my car for at least 40,000 miles, two cleanings with the oil and haven't had any MAF sensor issues. Maybe I fell for the marketing and the less-waste aspect of it. I don't know that I'll get another one since I've been influenced just as much by the people who say they're not a good product. I'm not in love with the product, but I certainly can't say anything bad about it.