[vikessuck]

I was just wondering if anyone has any input on using a custom K&N custom air filter on my 95 Aurora. Every since my buddy put it on, my check engine light is always on. He said that its no big deal but my mechanic said that the check engine light is on because by using the custom filter, it messes with the oxygen sensor. Can someone tell me how good or bad this is for my car, because I do like the way my car sounds with the way it is. My friend thinks that it will also help with my gas mileage, but I have yet to see the impact of that yet.