Ya my filter is RIGHT behind my fog light. When I run I remove it not my headlight. Im going to have to re-do mine because I want to paint it and I want to use 4in pipe all the store had was 3in. I did notice a difference in the sound and I picked up 1-3mpg. Before I was getting around 19-22 now I can get 23-26 usally stays around 24-25mark!