I am new to this forum. I own a 92 525i with reasonably low miles for its age. It runs extremely well, handles well, and mechanically is in excellent condition. But, I have one question that I am hoping to get some help with. About 40,000 miles ago, a new, OEM replacement exhaust was installed. But, from the day I purchased it, it has created an extremely loud droning sound, basically as soon as I touch the pedal. I have taken it to a German car specialist for all the service, and they have told me that there is nothing visibly wrong with the exhaust, which leads me to think that its bad on the inside. I have ordered a new muffler and resonator from Supersprint. So, I am wondering if anyone has ever had a similar issue. I am nervous that replacing the muffler and resonator won't fix the problem, although I'm not sure if thats reasonable to think. Its the first car I have owned that I would like to work on myself, and so I am still learning. Any insights anyone can give me would be greatly appreciated.