i hear that k and n filters are bad and let a lot of particles through. bUT what about the cold air intake setup? This boosts horsepower a little and allows you to hear the turbo. My main concern is that the filter keeps the engine safe. So if not k and n is there another cold air intake system that is better? Just really trying to hear the turbo and maybe get a couple extra horsepower.. perhaps even mpg.. mostly though keep the engine safe and clean. Right now I just have a drop in STP filter which I hear are good.