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UNI

Two Stage Competition Air Filter - NU-8503ST

  • Part #:
    303171
  • Mfg Part #:
    NU-8503ST
  • OEM/Ref#:
1 / 6

UNI

Two Stage Competition Air Filter - NU-8503ST

  • Part #:
    303171
  • Mfg Part #:
    NU-8503ST
  • OEM/Ref#:
MSRP: $32.95

Price: $29.66 10% off!
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UNI Two Stage Competition Air Filter - NU-8503ST
  • Uni-Filters two-stage foam design provides superior filtration while allowing maximum airflow
  • Ultra-Seal filters have a unique grease groove that allows effective application of sealing grease to tightly bond the filter to the surface of the air box
Specifications
Part #: 303171
Mfg #: NU-8503ST
Type Air Filter - OEM Type
Type Air Filter Element
Units Each
Weight 0.56 lbs
Alternate/OEM Part Number(s):
NU8503ST
UPC Code:
804451085032
Resources & Manuals
Fitment for UNI Two Stage Competition Air Filter - NU-8503ST

Part 303171 fits the following machines

Polaris
  • Magnum 500 4x4 1999, 2001-2002
  • Magnum 500 4x4 RMK 2001-2002
  • Magnum 500 4x4 w/EBS 2000
  • Magnum 500 4x4 w/o EBS 2000
  • Professional Series 500 4x4 ATV 2002
  • Scrambler 500 1997
  • Scrambler 500 2x4 2001-2002
  • Scrambler 500 4x4 1998-2012
  • Scrambler 500 4x4 Freedom 2002
  • Scrambler 500 X 2001
  • Sportsman 400 4x4 2001-2005
  • Sportsman 500 1996-1997
  • Sportsman 500 4x4 1998-2000
  • Sportsman 500 4x4 RSE (Remington Special Edition) 2000
  • Sportsman 500 6x6 2000-2008
  • Sportsman 500 EFI Forest Tractor 2011-2012
  • Sportsman 500 Forest 2011-2012
  • Sportsman 500 H.O. 4x4 2001-2006, 2008-2012
  • Sportsman 500 H.O. 4x4 50th Anniversary Edition 2004
  • Sportsman 500 H.O. 4x4 DUSE (Ducks Unlimited Special Edition) 2001-2002
  • Sportsman 500 H.O. 4x4 EFI 2006-2009
  • Sportsman 500 H.O. 4x4 EFI Browning Hunter Edition 2006
  • Sportsman 500 H.O. 4x4 EFI Deluxe 2007
  • Sportsman 500 H.O. 4x4 EFI Red Flame 2006
  • Sportsman 500 H.O. 4x4 Freedom 2002
  • Sportsman 500 H.O. 4x4 Hunter Edition 2005
  • Sportsman 500 H.O. 4x4 LE EFI 2008
  • Sportsman 500 H.O. 4x4 LE EFI Sagebrush Green/Black 2007
  • Sportsman 500 H.O. 4x4 LE Orange Madness 2010, 2012
  • Sportsman 500 H.O. 4x4 LE Polaris Pursuit Camo 2012
  • Sportsman 500 H.O. 4x4 Limited Edition 2005
  • Sportsman 500 H.O. 4x4 Mossy Oak Camo 2003-2005
  • Sportsman 500 H.O. 4x4 Richard Petty Special Edition 2003
  • Sportsman 500 H.O. 4x4 RSE (Remington Special Edition) 2001
  • Sportsman 500 H.O. 4x4 Spruce Metallic 2003
  • Sportsman 500 H.O. Bright White 2013
  • Sportsman 500 H.O. Indy Red 2013
  • Sportsman 500 H.O. Pursuit Camo 2013
  • Sportsman 500 H.O. Sage Green 2013
  • Sportsman 500 H.O. Touring 2010-2012
  • Sportsman 500 H.O. Touring Indy Red 2013
  • Sportsman 500 H.O. Touring Sage Green 2013
  • Sportsman 500 H.O. X 2002
  • Sportsman 500 Touring EFI 2008-2009
  • Sportsman 500 Touring LE EFI 2008
  • Sportsman 500 X2 2006-2009
  • Sportsman 500 X2 Deluxe 2007
  • Sportsman 500 X2 LE 2008
  • Sportsman 500 X2 LE Sunset Red/Black 2007
  • Sportsman 600 Twin 2003-2005
  • Sportsman 700 EFI 2007
  • Sportsman 700 Twin 2002-2006
  • Sportsman 700 Twin EFI 2004-2005
  • Sportsman 700 Twin EFI Browning Hunter Edition 2006
  • Sportsman 700 Twin EFI Dale Earnhardt, Jr. Edition 2005
  • Sportsman 700 Twin EFI Hunter Edition 2005
  • Sportsman 700 Twin Mossy Oak Camo 2003-2004
  • Sportsman 700 X2 EFI 2008
  • Sportsman 800 Big Boss 6x6 EFI 2009-2012
  • Sportsman 800 EFI 2007-2012
  • Sportsman 800 EFI Big Boss 6x6 Sage Green 2013
  • Sportsman 800 EFI Blue Fire 2014
  • Sportsman 800 EFI Deluxe 2007
  • Sportsman 800 EFI Forest 2012
  • Sportsman 800 EFI Indy Red 2013
  • Sportsman 800 EFI Med Yellow 2013
  • Sportsman 800 EFI Sage Green 2013-2014
  • Sportsman 800 LE EFI Browning Hunter Edition 2008
  • Sportsman 800 LE EFI Nuclear Sunset 2008
  • Sportsman 800 LE EFI Stealth Black 2007
  • Sportsman 800 Touring EFI 2008-2009
  • Sportsman 800 Twin EFI 2005-2006
  • Sportsman 800 Twin EFI Browning Hunter Edition 2006
  • Sportsman 800 Twin EFI Camo 2005
  • Sportsman 800 Twin EFI Hunter Edition 2005
  • Sportsman 800 Twin EFI Silver and Black 2006
  • Sportsman 800 X2 2007, 2009
  • Sportsman 800 X2 Deluxe 2007
  • Sportsman 800 X2 LE 2008
  • Trail Blazer 330 2010-2013
  • Trail Boss 330 2010-2013
  • Worker 500 4x4 1999-2002
  • Xpedition 425 4x4 2000-2002
  • Xplorer 500 4x4 1997
Reviews & Questions
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Browse 1 question Browse 1 question and 1 answer
Is this a throw away filter or is it re-usable?
A shopper on Sep 18, 2017
BEST ANSWER: Re usable. Purchase the cleaner and oil kit and you won't have to buy another air filter. Great product
4.8 / 5.0
29 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
24
4
0
1
0
Finish
5.0 / 5
Fit
4.7 / 5
Quality
4.9 / 5
Style
4.9 / 5
Value
4.7 / 5
Would you recommend this product?
Yes (3)
Would you recommend this product?
Yes
mice getting into the air box
It was a perfect fit and hopefully with the oil on the foam it will deter mice from chewing on it when it is parked for an extended time
September 1, 2017
Purchased
over 2 years ago
Finish
5 / 5
Fit
5 / 5
Quality
5 / 5
Value
5 / 5
Would you recommend this product?
Yes
Awesome
Dennis Kirk
January 27, 2019
Quartzsite, AZ
Purchased
1 year ago
Ride:
2008 polaris sportsman efi 800 touring
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Great Filter, Great Price
I was in need of a filter ASAP and was having a hard time finding one. Thankfully Dennis Kirk had what I needed!!

This is a great filter and a great price.

Thanks GUYS!!
September 16, 2010
Nokesville, VA
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
No Review Title Entered By User
Good fit, noticed increase in performance. Would recommmend.
May 28, 2012
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
Works Great!!!
Worked great even came with the metal mesh inside the filter so it's a true plug and play application. Only down fall is it's NOT pre-oiled so u will need to purchase oil for it.
August 30, 2015
The best
Perfect fit. I use United on all my ATVs
May 6, 2016
WI
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
UNI Filter
Great product, makes the machine breath easier. Its easy to clean and re-oil. I work in the bush all day and it keeps out all the dust and dirt. All around good OEM replacment.
April 27, 2011
Fit
4 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
A must for any application
Buy this and throw your old filter in the trash. Well worth the money.
October 9, 2009
Fit
5 / 5
Quality
5 / 5
Style
5 / 5
Value
5 / 5
No Review Title Entered By User
No Review Text Entered By User
October 9, 2009
Fit
4 / 5
Quality
5 / 5
Style
4 / 5
Value
5 / 5
My quad can now breath.
This filter does a much better job then the stock plus its reusable. Fits perfect and my quad breaths easier. I would recommend.
October 25, 2012