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10-13-2011, 12:00 PM
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ATV Enthusiast
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Member #19256
Join Date: Oct 2011
Location: Ottawa, On (Canada)
Posts: 77
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K&N or not?
Hey guys!
I own a Sportsman 850xp 2011.
Would you recommend replacing the stock air filter with the K&N one? (PL-5509)
IF so, why?
If not, why?
Thanks for helping a newbie in the ATV world! haha
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10-13-2011, 12:41 PM
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Polaris ATV Legend
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Member #5629
Join Date: Jun 2010
Location: Southern West Virginia
Posts: 1,631
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I think you'll find most folks here will say they use the Uni filter!
__________________
Con
 2007 Sportsman 800 efi , L&R tall windshield, Viper Max 4000 lb. winch with 3/16" Amsteel rope by Atv Winch Rope, 25' Amsteel tow rope by Atv Winch Rope, RDC fairlead, RDC deluxe gas cap, RDC shifter, RDC overflow bottle cap, RDC 2" lift , 27" Maxxis bighorns s/w on Vision Outback 12" wheels, Uni air filter, Dalton o/bl primary clutch spring, front and rear brushguard, front and rear rack extensions, and a SanAngelo backrest
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10-13-2011, 12:44 PM
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Polaris ATV Junkie!
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Member #13545
Join Date: Mar 2011
Location: Zephyrhills,Fl.
Posts: 1,112
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^^^^^^ X2 Agree!!
__________________
2011 Sportsman 500 H.O. Green
14" STI Wheels-26" Mud Trax X/L's
2500# polaris winch
Ricochet a-arm guards
Rev. override kit
Hid 3 light kit
3 light mod. w/relay
Uni air filter on both
Wifes
2011 Sportsman 500 H.O. Red
Ricochet a-arm guards
Hid 3 light kit
3 light mod. w/relay
Winch,wheels & tires still to go!
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10-13-2011, 12:56 PM
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ATV Enthusiast
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Member #19256
Join Date: Oct 2011
Location: Ottawa, On (Canada)
Posts: 77
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ok and that would be.... (noob)
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10-13-2011, 01:10 PM
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Super Moderator
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Member #230
Join Date: Feb 2009
Location: The UP of Michigan
Posts: 5,566
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We find that K&N does flow more air faster through, they do not filter that air very well. And on an off road machine in the dirt that's very bad. They don't filter fine enough. I'm not placing blame, but when I was working at the dealership, we saw a handleful of Polaris machines with the top end wiped out. They had a K&N filter on it, and the intake walls past the filter were covered in fine dust.
Uni seems to be a constantly good foam filter that isn't too restrictive, but filters the dirt out tremendously better the a K&N filter.
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10-13-2011, 01:28 PM
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Polaris ATV Legend
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Member #6579
Join Date: Aug 2010
Location: Central Connecticut
Posts: 3,114
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NOT!
Buy a UNI and dont worry about it!
CW
__________________
Mine
2007 Polaris Sportsman 700 EFI W/ 26" Maxxis Big Horns, Crusher Black alloy rims, EPI clutch kit, EPI HD springs F&R, Moose front/Ricochet rear CV guards, Kolpin Aux 4 Gal fuel can, UNI air filter, Moose camo tank bag, F&R rack extensions, Lock-N-Ride lo & hi windshields, Acerbis hand guards, CUSTOM mirrors and a 3000# Gorilla winch, W/Am-steel blue synthetic line, running thru a winch saver and an aluminum fairleed.
NEW: Thor's foot pegs and CUSTOM rear rack support frame and WES seat box. CUSTOM front and rear mud flaps.
Momma's
2000 Polaris Trail Boss 325 W/23" Wooly Bogger rear tires, Powermadd hand guards, UNI filter, Big Dawg rear and side bags, Polaris Mirrors, Kolpin grips, Quad Boss tank bag, Gas tank fuel gauge, Custom front 12v power port, Dual 1.5 Gal Kolpin fuel cans, mounted in custom rear facing mounts and a 2000# Super-Winch in a custom built mount W/winch saver.
CALL Thor @ www.TheATVSuperStore.com - 815-321-3888
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10-13-2011, 04:28 PM
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Junior Member
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Member #19551
Join Date: Oct 2011
Location: southern IN
Posts: 23
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I used to be a firm believer in K&N, had in on my race quad to pullin truck, to my Dailey driver. Now from reading more and more, i learnd K&N is really not the way to go, i only run it now in one truck, and it dosent see any dirt offroad or dust. and it also has a pre filter skin, those help but still not a sure thing IMO
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10-14-2011, 04:17 AM
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ATV Enthusiast
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Member #19256
Join Date: Oct 2011
Location: Ottawa, On (Canada)
Posts: 77
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Thanks guys!
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10-14-2011, 04:54 AM
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Junior Member
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Member #19079
Join Date: Sep 2011
Location: Manila
Posts: 14
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Wow! I'm glad I saw this thread. I already have a K&N Filter in my Sportsman 500. I'll keep using that until I finish off the charger that I bought.
What is the PN of the Uni Filter for a 2009 Sportsman 500 HO EFI?
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10-14-2011, 08:04 AM
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Polaris ATV Junkie!
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Member #1986
Join Date: Nov 2009
Posts: 555
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Quote:
Originally Posted by danxrs05
Hey guys!
I own a Sportsman 850xp 2011.
Would you recommend replacing the stock air filter with the K&N one? (PL-5509)
IF so, why?
If not, why?
Thanks for helping a newbie in the ATV world! haha
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I would also go with the UNI. Here's why...
There are basically three reasons to select an air filter...
1. You want to save some money.
2. You want increased performance.
3. You want better protection/filtration.
While paper filters do provide good filtration (especially with an outer cover), they become very inefficient quickly. The paper absorbs everything. If you want to see it for yourself, hold a new one up to a light, and hold one that has 100 miles or so on it up to a light. Considering they are pretty expensive from the dealer, if you want to keep your quad running efficiently, they are not the best option.
If you run a K&N, you really should run the outerwear cover. With the cover, they do provide decent filtration, but any so called "performance gains" are negated. As a matter of fact, unless you do a LOT of other performance mods, you are not going to see any measurable gains in performance from any air filter (with or without an outer cover), and even then it will be minimal. Plus, cleaning, and re-oiling a K & N correctly is a bit tricky. So, considering they are initially more expensive (along with the cleaner & oil), they may not be the best option.
The UNI (or Twin Air, or No-Toil) type filters provide excellent filtration that stays pretty consistent over a longer period of time than paper filters. They also provide decent air flow. So, at least you don't loose much performance over a period of time. Considering that UNI filter kit is relatively inexpensive when you consider their longevity, the above makes them an excellent choice.
If you decide on the UNI, I would get two. That way you always have one cleaned/oiled and ready to go.
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