Ever since I installed my catback I have noticed more rattling and popping sounds. First, everytime I accelerate hard I can hear this rattling in the dash somewhere, and no I am not pinging. I use the right octane and always use the same gas from the same place. I also hear vibrations sometimes at the back of my car. I was going to get under it today to see if there is something loose. Anyone else experienced these types of problems? Any suggestions what to look for? I know that my exhaust is a lot louder now, so maybe its just reverberating and causing random things to vibrate.