anyone with the umnitza change their filters to another brand? such as an apexi, as i am looking into it and was wondering what anyone else has found. i have noticed my engine making more noise as of late and think it could be that filter, as i never thought it looked all that filter worthy, and after reading all the filter arguments that were done in another forum. i was just curious as to the flange size that the filter is clamped to. and if anyone else has done this. i have the 1 version btw...