Hopefully someone knows what this is... When I shift from 2nd to 3rd at about 3000 rpm I get what sounds like a clunk,but with the windows down it sounds more like a backpressure pop. I also hear this noise sometimes going from 3rd to 4th. It doesn't happen when I drive like a granny or when I am getting "on it". Only on normal acceleration.<p>The only mod I have done is the Resonator Removed.<br>Thank You!!