Friends: I have 2007 RR Sport HSE. Recently, the fan noise became very loud at acceleration. I researched the problem and found the most likely culprit was the fan clutch failing. I replaced it and now the problem is worse! Fan noise is very loud on acceleration and power is decreased. I also notice that fuel mileage has decreased. I read somewhere that these symptoms could be the result of an exhaust leak. Any experience or insight into my problem? Many thanks.