intake

i read somewhere that if you have too much intake its bad at low revs, thats why you can get dual intake system with a small airfilter and big one(simular to twin turbo)
but i went to the k&n airfilter site and it says the bigger the intake the better.

Sort of true, but your wording is wrong. ;) Dual intake does not come from the air filter size, it comes from the manifold. A shorter manifold is used at high revs because the air doesn't have to travel as far to reach the engine. A long manifold is used at low rev because the engine is not breathing as fast, thus the air will not have to travel as fast. That's what dual intake manifold does.:)

i get it, thanks :)