The Amsoil Ea replacement air filters (dry) are supposed to be superior to K&N types and of course the stainless steel mesh and foam filters. But to date, I've not seen any type of test done on them (other than what Amsoil states on their site that is)

 

R2C tested the Amsoil and showed that it had 96% filtering efficientcy, if i remember correctly.

 

which part # amsoil so i could shop around for them?
and pics please =D
thanks

 

Amsoil filters well, but flows pretty close to stock. from what the filter gurus say.

 

I actually researched this before. From what I saw, the closest Ea cone filter to the Stillen was a 1-2" longer. Which would run into the end of the Stillen housing. I still would "probably work" but I never followed up and ordered one.

If you are replacing the JWT filter, then you have much more room to play with.

Measure your JWT or Stillen and go to Amsoil's site and research. What he ended up with might not be what your requirements are.ie. settling for a smaller or larger size.

 

Such as? I've not really researched but I couldn't find any good tests for the Amsoil Ea filter (panel or cone style)

 

Here's what the 350z TT guys think about the Greddy mushroom FOAM filters.
http://my350z.com/forum/forced-induc...-tt-setup.html

Explains why everyone running that TT setup are all trying to replace them with a K&N or similar.
http://my350z.com/forum/forced-induc...ment-part.html

 

I've sat here looking at all the bickering one way and then the other... and to the life of me I still cannot understand why someone has not asked the question.

Why do you want to change from the K&N? Is it not making extra HP as advertised? Has it failed?

I mean, if you bought the CAI you must have wanted it, right? If indeed you bought it, (and it didn't come with the car) then what went wrong?

Air filters are on our engines for one thing, to filter the incoming air, removing the most particulates possible, while remaining as free flowing as possible. All the while, the should never over the LIFETIME of the filter pass dirt on to the intake, and critical combustion chambers of an engine.

Paper filters from anybody, anywhere at a point will pass particles that an oiled cotton gauze filter simply will not pass. In the beginning, gauze filters will always pass more air than paper. As paper becomes dirty there are several ways the particles start slipping through (even though they pass larger particles from the 'get-go'). Depending on the angle of impact on the filtration media the dirt will begin to build up, up to the point where it will severely reduce the airflow from when it was installed, and as it begins to build dirt, dirt itself simply pushes through. Paper filters, especially mounted low can, and will collapse from water damage. Not like they've been crushed, of course not, but the pleats will start to compress, wrinkle, and distort from their original shape.

The purpose of oiled cotton guaze is to not only provide better filtration, huge amounts of incresed airflow, but horsepower increases across the powerband. With a million mile warranty, it seems redundant to NOT take advantage of it.

Is it that you don't like cleaning it?
If I may ask, how often are you cleaning it? (Unless you're driving off-road you should be able to run 3 times what you do with a paper filter before you have to touch it.)

The way K&N's handle the dirt, they may start to look less than perfect, but be assured that they are performing better than a brand new paper filter, even though they may have 15,000 miles on them.

Are you aware if you have any problems what-so-ever with the filter that K&N will replace it?
If you're having problems with a dealership trying to claim you have MAF problems because of it that K&N has a department setup ESPECIALLY to keep you from having to fight with the dealership? They will step in and analyze any MAF that a dealership claims has been harmed by their filters.

I'm curious more than anything as to why one would go from a proven performance product back to paper. It flys in the face of the technology that has been been proven time and time again.

Also, I have no problem with it, no argument, nada. But it would seem to be the easiest thing to just go back to the stock airbox, where at least you can drop a plate filter in every other oil change. Sure a lot easier than the alternative, which is getting down there where the cone is sitting.

And, yes... I agree it's a PITA to change out the darned thing. But considering you can leave it in for 30,000 to 50,000 miles before changing it's not like you'll be doing it very often.

Oh... that and giving up the performance advantage. To each their own, all the best.

 

You must not have read what Hydrazine has said on the issue nor have you read any of the air filter tests. It really would have saved you a ton of typing.

 

so... I've been putting off dealing with replacement filter for a long time now... currently I'm doing a bunch of cosmetic mods in the engine compartment and am planning for both Stillen and OEM airbox setup...

I bought a new Wix panel filter for the OEM - I plan to eventually do some testing to determine if the OEM is in fact worth considering over Stillen - if so I'll order Amsoil dry panel filter for permanent use.

Today I finally took the time to measure all dimensions of the Stillen cone filter and find a replacement - either Ams or AEM... I have been asking for a couple years if anyone has found a replacement - and various responses come up.

After looking up sizes and K&N, Amsoil and AEM, I have found nothing that I would consider using to replace the K&N Stillen - simply because there is no size close enough for me to consider. The closest Ams is EaAU6065, but it is totally out of the question because the media height is 6.5" (Stillen K&N is about 4-1/4" - so there is absolutely no Amsoil conical air filter that will work (which sucks, because I'm a fan of Ams).

AEM comes close with 21-209DK and 21-209EDK - but the top OD is a bit too big and I think the flange ID is a little small... this filter could "possibly" be used - but the size just isn’t quite right for me to consider.

The K&N sizing chart lists the specs closest to the Stillen size as being part number RF-1009... the 4600 series and maybe RT-4590 "might work" - but from what I can determine the RF-1009 is the K&N part - so the quest is to find a dry filter replacement for that K&N part number/size.

Part of me hopes after testing, I find that the OEM box has clear and concise stats for me to use it exclusively over the Stillen - it should be much easier to find correct fitting panel filters (dry, paper or oiled) than the cone filter.

If anyone finds something better fitting than AEM or R2C to replace Stillen’s K&N - please post up!

 

I posted this info page 1, post #7. From what I remember/read, the Stillen cone media height is 5". So we are talking about a 1.5" difference in height. IMHO, I understand you don't want to cut the stillen but IMHO the portion that needed to be trimmed wouldn't change anything function wise. I haven't looked close but I don't think the whole piece would have to be trimmed either.

 

based on my measurements and the dimensions listed on Ams and the clearance in my car - there isn’t any way that would fit (reasonably enough for me to consider using)... btw, the media height is quite a bit less than 5" - my notes are at home, but I think it is about 4-1/4" – there isnt any way the Ams would fit.

The AEM is much closer in specs, but still not close enough for me to consider…

 

I just measured it (again). It's exactly 5".

 

I'm measuring filter element only (not rubber flange or metal top) - and I'm measuring vertically (not on the angle)...

You must be measuring some other way - or have a different size filter.

In any event - whether its 1.5” or 2.25” bigger, its not enough clearance (for me) to consider... the nose would be right up on the radiator core support - that’s even if it fit (if measured the way I did, it wont fit).

Grab it and try it Jeff... no point in squabbling about the size of the Sillen... I'm convinced the Ams won’t fit. But maybe I'm wrong?

 

4.5" would still be well inside the filter media. Can't believe you made me take a picture: (although the Amsoil site seems to use a pure media height and K&N seems to use the total height. It's hard to tell)
There's a good 2"-3" of additional room if you cut the portion of the stillen airbox near the filter nose. I looked at stillen plastic piece (again) and that piece really does nothing. I say it would fit with minimal trimming. Go out to your car and take a look under the composite piece if you don't believe there's enough room.


But I DO understand you not wanting to cut up the Stillen part though. I have the same reservations and wouldn't do it if I didn't have to. But I'd consider it if I choose to go this route. The minimal cutting is worth getting to use the Amsoil dry filter IMHO