Thanks for serving the country Irunwire...I have had K&N's on pretty much all of my machines and have had outerwears on them and they do give a good amount of increase of power, but do allow extra particles to get past and it isn't worth it...So on my 450r I decided to go with a foam and I would recommend you do the same...Although I do like K&N's I don't want any harm done to my quads so I am sticking with foam for now on.

 

Hey bombrider04 thanks for noticing. I love serving my country. I have one of the coolest jobs that a person could have, working on the high performance F-16, but soon will be switching to the new F-22 Raptor. Thanks for all the advice, I went ahead and ordered the UNI filter for my 400ex. I already have one on the LT80 and the TRX90. I really do not want to mess up the inside of my motor so I decided to go with the foam. Once again Thanks.

 

No problem and be safe...I'm sure I will cya around on here.

 

I have only ever had a K&N on mine. I run the pro design comp. filter, which is like 2 foam filters on top of each other. I also run the EHS racing lid w/ outwears. I have had no problems yet and always have a clean carb.