i use the bmc race fitler because it weighs almost a half a pound less than oem.
weight reduction is more important than a few horses

every ounce lost makes the bike handle even better

 

first of all you must not know a lot of racers because everyone i know use bmc race filters.
see how arbitray a statement like that is.
not to mention that if you ask this question on 1000rr.net the overwhelming answer will be bmc race and then someone will point you to various back to back dyno charts showing a 2-3 hp gain with the bmc race filter over stock.

but you are right though
i rider who spends 2 grand and goes to freddie spencer on a stock bike will outride another rider who has spent the same on mods with no real training.

it doesnt hurt to mod the bike but do mods that help, safety, handling, braking, weight reduction. all will be noticed more than a few more horses.

 

I picked up a K&N because I run the K&N in my cars and my goldwing so why not.

 

well like i said the only thing that matters is performance. dyno runs on the rc51 with a K&N lost power. www.rogueracing.org

dyno runs on the 1000rr gained power with the bmc race
www.hooliganbiketech.net

since these are the only dyno charts i can find with air filter dyno readings

the numbers dont lie

 

bmc

 

I'm happy with my BMC race filter.

 

Don't mean to argue, but no two dyno's are the same, therefore unless a K&N & BMC are both tested on the same bike on the same dyno, the numbers mean nothing.

 

i had a K&N before but now i have a DNA air filter....i feel the same but after dyno i saw a half (0,5) hp less than the oem filter....(cbr 600 rr '04)....

 

What, no mention of Pipercross? Pipercross air filters are huge in Europe. They are also the only filter that I know of that gives you decent HP gains and filters air better than an OEM filter. WSBK teams use them a lot. There is a lot of talk about them over on 600rr.net. They are reusable, but they are multi layer foam instead of cotton, so it holds up better and lets less dirt through than a typical cotton type filter. Typical HP gains are about 2HP on the dyno's that I've seen. I can provide links for anyone interested in the dyno's

 

I disagree with that statement. Not because I'm endorsing some other sort of air filter or because I want to see HP gains; I'm still running a stock filter but that is because I haven't had a need to replace it yet. However, the reason I disagree is because engineers design what they think is best but they are governed by corporate individuals who will look at bottom dollar only and will use cheaper materials to produce a better overall profit. Now, I'm not saying anything against the stock filter or stock setup but I don't necessarily think that what the engineers designed and what is actually on the bike are the same thing or the greatest thing. Now, in this particular instance, I would think that a company which designs nothing but air filters would actually produce a better filter than stock. Anyhow, that is just my thoughts on the subject.