THERE IS A NOISE FROM SOMETHING LOOSE THAT I HAD CHECKED OUT A COUPLE TIMES WITH NO SUCCESS. IT COMES FROM THE BACK END OF CAR NEAR TRUCK AREA AND SOUNDS LIKE A LOOSE MUFFLER OR A KNOCKING/VIBRATING MANIFOLD WHEN DRIVING OVER BUMPS OR A ROUGH SURFACE. THE NOISE WASN'T AS NOTICEABLE WHEN I GOT IT IN 2010, BUT HAS BECOME MORE NOTICEABLE OVER THE YEARS. THE MAINTENANCE AND CAR IS WELL CARED FOR.