k and n and pipercross have put in a lot of money to make thoues fillters thers tested on wrc rally cars and they drive them hard and the dust condition ther put under i think that ther good for turbos and noramily asp engine i run 2bar on my cossy with a group a cone filter and nothing has gone bang the air box bering in mind can flow the same amount off air then a cone filter its only a space saving option for most big powere car that have all tanks every were and need to move things to gaine space