dna vs k&n vs bmc filters

[Smokin]

I have read quite a bit on other forums and most prefer BMC due to K&N letting too much crap through.

[motobob]

I'm under the impression these filters do not add any HP at all.

So has any one had a bike on the dyno before changing filters and after. I got a K&N cheap but am in no rush to fit it (racing use only so I'm after air and who cares about some extra dirt)

[Smokin]

I'm under the impression these filters do not add any HP at all.

So has any one had a bike on the dyno before changing filters and after. I got a K&N cheap but am in no rush to fit it (racing use only so I'm after air and who cares about some extra dirt)

Thats what i have read also, have seen a couple of posts that say they had lost some power on the dyno using K&N filters as well.

[Toast]

http://www.motorcycledaily.com/21sep...andnfilter.htm

Their ST1300 got 6hp from one...not bad. Ofcourse it will differ with all bikes, but it definitely can benefit some, as seen in the above article.

[DEATH_INC.]

Dunno about k&n letting shit through, I run one in the Terrano and it gets pretty farkin shitty (I occasionally do the off-road thing) and it doesn't seem to let fark all through.
The Gixxer has had one for the last 40,000k's and it's still going fine .....can't be too bad.....

[Motu]

What they let in you can't see - like I said,you only find out by oil analysis.But is that enough to cause wear? Again,you can only find out by oil analysis,by picking up increased metal particals in the oil.This is beyond 99% of most people,there is only one laboritory in NZ,and then you have to be able to interprupt the results.And what does it matter on a motor that won't see 200,000km anyway? K&N is fine....but not good for your motor in the long run.

[motobob]

Their ST1300 got 6hp from one...not bad. Ofcourse it will differ with all bikes, but it definitely can benefit some, as seen in the above article.

Ta Dude. Said the porker had a restrictive stock filter. Any info on a sports bike like a 600?

[Toast]

Ta Dude. Said the porker had a restrictive stock filter. Any info on a sports bike like a 600?

Nah, sorry dude...I'm guessing the gains would be much lower. But as I said earlier in this thread, I felt a slight difference from the seat of the pants when I stuck one on the '02 6R I had, maybe 1-2hp through the range (and it's not a feeling brought on partly by a massive change in sound, like when you get a new exhaust). That was a DNA I believe.

[geoffm]

BMW's gain no power at al from K and N filters. Pn the other hand they dont lose any. The filter area is big on them - same as the beemer cars.
IIRC the R6 looses a couple of HP, according to a test a couple of years ago.
Geoff