I have a '98 Rav4 L with an exhaust problem. It is pretty normal when it is intitially started, but during acceleration (especially just starting out in the morning) it "buzzes" or "rattles." The closest description I can think of is a moped or a weedeater. I changed the muffler and thought I had it licked - but it still sounded bad. The guy at Meineke told me I did not have any exhaust leaks. So, I am stumped. I am certain it comes from the rear of the car and that it originates at the muffler. IS THERE ANYBODY OUT THERE THAT CAN HELP ME SOLVE THIS PROBLEM??? It is driving me nuts!