I have been running a K&N air filter for two years now in my bike with no problems. It was actually recommended by many for better air flow than the stock. It's also nice to be able to take out and clean and put back in...dont hav to buy another filter. It pays for itself with that respect.

 

Go with BMC or stick with the OEM.

 

I think it's because aftermarket filters are not design specifically for the engine or sensors for the engine. Running oiled type air filters can ruin sensors in the intake and cause problems. And of course, the dealer would not take chances of running with aftermarket filters.

 

i am pretty sure they won't ruin sensors in the intake....it's more because these bikes are tuned for a precise air flow and the stock filter gives that....you go aftermarket that either restricts or increases air flow, you need to mess with the FI to compensate and most people don't....you can look here on the board though, a ton of people run an aftermarket filter without a tune so it isn't gonna destroy you, but you are likely not getting an increase and in some cases might be decreasing HP....

if what you are suggesting were true, racebikes would need different intake sensors...i doubt they intake sensors are all that different from stock, as they are just sensors, what changes is that the FI is specifically mapped to compensate for a drastic change in air flow..

 

K&N is the shiz

 

k&n is the the shiz . i want one so bad... but i wont get one until i can afford it and a pcIII. that way i can get a map for it and my pipe and therefore have all the right air to fuel ratio that is needed.


that, ladies and gents, is how you do it

 

I run K&N air filters in every vehicleI own and never had a problem. Also run a K&Noil filter on my F4i.

I thought the knock on them is they flow MORE air, providing less filtration and the possiblitity of sucking debris in your engine.

 

Now this is a possibility IF it isnt cleaned & recharged like it should be.

 

Personally, I have heard too many bad with the good for me to go with K&N. K&N have been shown to actually decrease hp in the 1000RR. Personally, I would go with BMC. In reallity, I am still with my stock filter.

 

I'm willing to bet the bad dyno results were from ppl who didnt like K&N to start with.

K&N's have flowed better on everything I have ever installed them on. And that list ranges from VW powered sand rails (open system), street bajas(open system), street bugs, small block chevys, and a few diff bikes.

And I think if they decreased performance they would have stopped selling them LONG ago or corrected any issues with their filters. Hell I never heard of BMC until last year so...