Are you talking about the dryer hose with a K& N attached to it. Be carefull, those get holes in them very easy. My advise is look elsewhere to a more quality product
I had it on mine for a few months and it works really well lots of air can get through and it really screams. Only problem was you can't drive it in the rain which didn't work to well for me. I didn't get it dyno'd but I now have the MAC straightshot and it produces about the same gains.
I think ponyboy03 is probably worried that if he drove in the rain water would somehow penetrate. I have the KB and I'm careful when I wash that fender. Its so close it makes ya wonder