get the rear off the ground did it in gear give it some gas and put brakes on do it a dz times and see if you hear the noise. then have a friend stand in the street and brake as you go by then have them stand on the other side and see it they can heard the difference and if front or back

2001 5sp. K&N stock filter 215/70/15
If your check engine light is on at least you know the light still works