KWIK RACING INC.
Active VIP Member
I've seen a few dynos on other forums too.
The biggest difference I've seen was either with a modded airbox, or a hi-flow intake tract, like those made by Fuel-Customs. (Don't confuse intake tract with billet adapter, the adapter makes no difference on most models. The quads an adapter makes a minor difference on is quads with intakes similar to the YFZ by getting rid of the back fire screen, but even still, its not much of a gain at all.)
That being said, there is small changes in performance with an air filter, but my recommendation when buying an aftermarket filter, is getting one that lasts, and is easy to clean.
Easy to clean: K&N with outerwears, or a dual stage foam filter where the stages aren't bonded (you can separate) like the UNI filters. This makes cleaning a breeze.
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Very impressive answer there Shaun! Yes you are mostly right with most models.. doing just a cleaner, no other mods = a big fat goose egg for hp. Now this apply's to can-am, not sure on any other model but some should be the same, i would think.
now doing a open air box lid by EHS or doing a dual air inlet from the front of the air box combined with a pipe ( at least the pipe ) and a intake and a good feul controller has shown an increase of approx. 1 hp..
this is with the stock 09 up square filter. the filter has a 1/2 in thick piece of foam around it and it comes dry from the factory.. that foam surround should be oiled with foam filter spray oil... if you don't and use it dry on the stock filter then your trottle body will be covered on the inside with a layer of dirt. the stock filter needs the foam piece oiled. then it filters good...
if you don't want to replace your paper filter all the time... the Twin air power flow kit has shown the least amount of hp drop... yes, thats right, drop! the stock filter has shown 1/2 to 1 hp more than aftermarket. The twin air being a foam filter, filters excellent. seems to filter a tad better than stock, is the general concensis since 07.
other filters have shown lower results, but where only talking peanuts here...
so if i had the 09 up square filter with the oiled foam surround on my ham, i would keep it UNLESS you want a washable filter. then twin air and uni, is what i would do..
most test results since 07 have'nt yeilded good results on the hams with a k and n, whether it be hp or filtering.. now some people swear by there filter. to each there own, i guess.