2jz240sx

So I I'm having a problem with my b20b4 ek hatch. When I'm driving down the road in 5th doing between 45 and 65 with a consistent throttle position my car makes a sort of low and high hum. The source. Of the sound is most noticeable from the exaust its constant and speeds up as I excellerate and occasionally when I decelerate. Car has new map sensor, iacv, intake temps sensor, new o2 sensors ect..... not really a change In performance, just annoying.