Hey guys. I got a 2001 2.4t and im like 1000 away from the 15000 mile mark. I was wondering when im suppose to change my filter. Im gonna change it at 15k becuase i wanna put a K&N air filter in it and add a couple more horse. Does anyone have one of those?? i heard ur car sounds lowder when its in. I wonder if it makes the turbo sound a bit louder. I hope it does, i love the sound of the turbo. anyways please reply and tell me wht ur experinces are.