Thread: 2007 GXP - Strange knocking noise to stump the best mechanic

Braking and Acceleration has no effect on the noise so it's not engine RPM related. It's vehicle speed related so related to something spinning at tire speed. If I'm correct, the noise should speed up the faster you go. Inner CV joint?

I found it is definatly something with the exaust. I havn't fixed it yet, but the other day it was missing a rubber tie rod or something in the middle of the exaust that was supposed to be holding it down. I replaced both on each side and the noice almost completely went away. It still does it now just around speeds of 50 or greater. Even then its not nearly as bad as before. I'm going to upgrade my exaust soon so hopefully that will stop whatever it is. I'll check out the CV joint as well just in case. It probly is something related to what Dan is saying.

Thanks for the help guys