When i put the car in reverse i often hear a ping! noise coming from under the car. Doesnt seem to be hurting the car but i really have no idea anyone familiar with something like this? Im automatic

Also i had the gmpp header added this weekend all can hate on gmpp all they want, the car sounds mean right now.

 

might want to add if your auto or the stick so people know, but imo its nothing cobalts do some funny stuff sometimes :-)