I was at the Polaris dealer this morning checking on an air filter for my trail boss 330. I was looking at the K&N but the parts guy said that for what they cost he would use a Twin Air filter for better performance and less cost. So I just wanted to see what some of you are running in your atvs.

 

Discussions on filters like talking about oil and politics! EVERONE has a preference. JUST MY OLD OPINION,stock with prefilter sleeved OR UNI foam filter.I'm SURE you will get other responses. Good luck

 

I've used 'em all but came back to stock with an outerwears pre-filter for the best filtration.

If an after market filter increases performance, something may be out of adjustment in the carb.

 

I know the K&N doesn't like dusty conditions......Especially with no pre filter.....I went back to stock.....

John

 

Had K & N, and Uni filters and now I just use stock. Dont notice a difference between any of them, but I'm not tearing into the motors to see if they are dirty or not either. I cant see anyone going wrong using stock parts on everything other than availability and price.

 

Nothing but stock for me. My buddy has K&Ns and they let a dust through.

 

When you use a stock one with sock your not left with any questions about filtration reliability - STOCK OEM

 

I've been running a K&N in my 325 for about 4 years now. Never had any issues, but I do use the prefilter and keep it oiled. That being said, I have it because it came with my RCR stage one kit. All my other quads use the stock paper filter. Two of those do have the sponge prefilter that I keep oiled. But I'd just stay with the OEM filter too.

When in doubt, check ebay and buy in bulk. [img]i/expressions/face-icon-small-wink.gif[/img]

 

Well ask anybody on this forum about my view........I wrote many posts about this topic and STOCK for me!!

More air flow in my view= less protection.
The rest are great for the blacktop........But paper is the best prevention in my book!!
.....Caper.........

Now if I can find a after-market Paper air filter part number for my 2006 Sp 450 and not spending 24 dollars each at the dealer would be better!!...LOL......

 

Stock OEM.

I remember reading some independent research that showed that while a K&N style filter flowed better out of the box/clean when it got a little dirty it didn't flow as well as a stock paper element.

I know I noticed that when i ran one in my truck which seen lots of use on dusty gravel roads every day. You noticed the increased power when it was clean or new but by the second day or even the end of the first in really dusty dry weather that power gain was gone. When I changed to paper filters you didn't get a power increase but it was much more consistent.

I also got tired of having my vehicle down for so long when i had to service the K&N. It took time to wash, took longer to dry and then you had to fool around oiling it. You ended up blowing an afternoon or longer just servicing the stupid filter. With the paper element it was 1 minute job-just remove and replace. And it never failed that when I really needed to change the filter I didn't have the proper chemicals on hand to clean and oil it. Half the time I had to order the stuff since the local parts store didn't consistently stock the recharge stuff. It got to be a pain.

Unless it was a race car I stopped using K&N. The paper filter was more practical in every day use. On my ATV I really didn't see that much of a difference after I rode it for a day or two anyway. Like with the cars an trucks using the stock paper elements was much more practical especially given my heavy use.