im guessin i need to have it grounded for something electrical... anyone know for what tho? would not having this ground cause unwanted sound from the rear speakers?

 

It's the grounding wire that goes to the OEM muffler. You really don't need it. It just makes the ground potential of the muffler/exhaust, the same as the rest of the vehicle. I's not going to induce any kind of "whine" in your speakers if not grounded. You can actually slide under the car and unbolt it from the frame is you don't like it hanging there...

 

^ +1 remove it..

then post up some pics of your new exhaust dammn it...

-J