alright guys. so it sounds like its coming from my drivers side but when im listening to the motor run i can sometimes hear a kindof slight knocking sound its not that loud or anything but its kindof noticeable only at idle. i dont hear it too much while im driving but that might be because my exahust is loud. it happens at random times and i hear little crackling sounds out of my exahust at idle. anybody know what this might be?