hello there.was my o2 wrx to work this morning and started to hear this funny nosie from the passager foot well but its only there when i let the throttle off.so i put it on my ramp i couldnt see anythink hangin off.so i got someone to sit in and drive it.i could hear knockin coming from the front drive shafts and where the prop come out of the back of box is a bit rumbly.just wanted to no if anyone has had the same problems as me.thanks phil