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Frank ZX

Which is the best air filter

17 posts in this topic

I need a new air filter.I ride mostly on the street.Should I get a Uni,Twin Air,or a K&N?Which one flows the most air?

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K&N flows the most air

How do you know that? I doubt any of us have done flow tests on the 3 filters to know this.

I would recommend the UNI and i think its prolly the most popular around here.

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im not sure which one is better for airflow, but uni is most popular for off-road and dirt riding conditions, the K&N would be better if you were 100% road

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UNI and Twin Air have worked well for me, tried K&N quite a few years ago and found grit in the airbox a couple of times, haven't used them since.

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i can tell you k&N absolutely flows more air--- it also flows more dirt.

i would never put one of those on anything i own unless i was racing and O/H the engine after every race. the uni or twin air foams are the way to go. if you run a k&n, check the intake tube after a while. it will be coated with a nice layer of fine dirt-- uni that i use doesnt.

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A clean K&N flows the most air, but filters the worst. It should be fine for street use. A foam filter is the best for off-road use. UNI and Twin-air are both good foam filters.

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A clean K&N flows the most air, but filters the worst. It should be fine for street use. A foam filter is the best for off-road use. UNI and Twin-air are both good foam filters.

true

Dont use K&N off-road, i have one on my 250L and if im riding in dusty stuff i clean the airbox every 1-2 rides

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I used a K&N for about a month, until I found the previously mentioned silt past the filter. IF you will only see pavement, it is the way to go. IF you may see dirt, don't!

I typically stick with the stock filter, but that is just because I have a whole stack of 'em. Really like the Uni for it's sealing lip. Not a huge fan of the Twin-Air. It seems a little thin to me. Not that this effects its filtering abilities, I just wonder if the sidepanel can get enough pressure on the edge to seal as well as the Uni or stocker.

I am going to a 24hr race in a few months. For that race we are using the Ready Racing filters. New one in at each and every pit stop, and throw the old one away.

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Uni here too. I have nothing to compare it to, but I just got done riding in very dusty conditions and when I took the filter off to clean it there was no dirt to be found on the "clean" side of the airbox. Good enough for me:prof:

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I rock the K&N on the road, and on the dirt if there is no dust. No dirt/dust in airbox past the filter. Any chance of dust use the stocker or the others.

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I rock the K&N on the road, and on the dirt if there is no dust. No dirt/dust in airbox past the filter. Any chance of dust use the stocker or the others.

I agree, the stock foam filter is excellent, it's free with the purchase of the bike, and it flows just like any other foam filter.

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I agree, the stock foam filter is excellent, it's free with the purchase of the bike, and it flows just like any other foam filter.

stock foam air filter?? mine came with a paper element filter.

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stock foam air filter?? mine came with a paper element filter.

That's because you've got an L. We are talking about the R's and the big slab of foam mounted sideways behind the left side number plate. The K&N for the R has a good portion of rubber surrounding it that does not sit perfectly in the edging around the airbox. This allows dust and fine particles to pass (unless you put a large amount of grease around the edge). The K&N also flows more air through the filter media, but this is due to the fact that a properly oiled K&N will allow larger particles to pass than a properly oiled foam filter like the OEM or Uni.

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You will like the Uni. Nice snug fit around all edges. Before you install, hold the Uni aluminum fram in the box and bend until it fits best.

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