im runnin a uni air filter on my z 250, everyone else seems to be using a K&N. is K&N better (as in getting more air to engine) than uni? what about the twin air filters? oh, and if i get an outerwears prefilter would it be safe to run with the air box lid off cuz it seems like there is noway much air gets in there with that thing on. and where can i find the prefilter for the uni, i always find em for K&N?

 

The K&N filters are typically less restrictive than UNI filters, and the price is usually higher also. As far as the prefilters, K&N offers a line of filters that clamp directly onto the carburetor eliminating the airbox entirely. This setup requires a prefilter since the air filter is exposed to the elements. These setups are usually for extreme HP motors and probably not the best choice for a Z250.

Keep in mind that I have no specific knowledge of the Z250 and what these 2 air filter companies offer for this particular bike. But for the LT quadracers and other large bore 4 stroke sport quads, everything I said was correct.

 

im runin twin air now but soon im gonna get a k&N

 

I like foam filters better than k+n, some people say they trap smaller particles than the k+n can. That said, I've run a k+n filter on my truck for 3 years with no ill effects.

 

the difference between a UNI and K&N as far as performance, is next to none. if you dyno'ed them back to back the hp would be the same, maybe like .01 more hp. not worth it. you allready got a uni. you wont notice the difference, i guarentee it i have had them both.

 

I don't feel there is any difference besides price. Gotta keep them both clean on every ride no matter what brand you have.

I run a k&n right now because I already had it, when I buy a new one it'll be a twin air or uni though.

 

Yeah this is one of those questions that are hard to answer and most ppl swear by one or the other. I have a UNI just for my own peace of mind I guess. I think either are a good choise.

 

the only reason alot of people swear by K&N's is because u cant over oil them like a foam filter. alot of people over oil foam filters and they think they feel down on power because its only a foam filter, so they get a k&n and they r like wow[img]i/expressions/face-icon-small-shocked.gif[/img] when in reality the foam filter(properly oiled) makes just as much power as the k&n(which is less reliable).

 

k thanks for your input. how do you know if you over oiled ur filter? and what are the effects? and also, what about the prefilter for uni, where can i find em?

 

I have run both a uni and a K&N filter personally I like the K&N better it is alot easier to clean and oil in my opinion. But both seem to filter well and both performe just as well.