Which is the best air filter


16 replies to this topic
  • Frank ZX

Posted August 15, 2007 - 10:24 PM

#1

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?

  • crash90

Posted August 15, 2007 - 10:30 PM

#2

K&N flows the most air

  • Denn10

Posted August 16, 2007 - 05:37 AM

#3

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.

  • hondacrf150f1

Posted August 16, 2007 - 05:54 AM

#4

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

  • creeky

Posted August 16, 2007 - 06:20 AM

#5

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.

  • martinfan30

Posted August 16, 2007 - 06:43 AM

#6

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.

  • Talonboy

Posted August 16, 2007 - 07:31 AM

#7

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.

  • hondacrf150f1

Posted August 16, 2007 - 02:58 PM

#8

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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  • eastreich

Posted August 16, 2007 - 03:25 PM

#9

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.

  • walshdanielm1965

Posted August 16, 2007 - 03:43 PM

#10

+1 for UNI

  • Bibleman

Posted August 16, 2007 - 04:49 PM

#11

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:

  • brp2004

Posted August 17, 2007 - 07:43 AM

#12

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.

  • exaresix

Posted August 17, 2007 - 03:52 PM

#13

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.

  • martinfan30

Posted August 17, 2007 - 08:50 PM

#14

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.

  • eastreich

Posted August 17, 2007 - 09:06 PM

#15

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.

  • Frank ZX

Posted August 18, 2007 - 09:04 AM

#16

I ordered a UNI filter today.Thanks for everyones input.I love this site,lots of info!

  • resslera

Posted August 18, 2007 - 10:52 AM

#17

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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