Hello everyone, While driving my 550, sometimes I'd hear a metallic rattle. I figured the sound would be from a loose bolt on the exhaust. But upon having it looked at, I found out the central exhaust silencer/muffler needs to be replaced. This isn't something that needs to happen now, but I'm curious about options. These are the options I can think of at the moment: 1) Just replace the part. 2) Central silencer/muffler delete and straight pipe from the cats to the left and right mufflers. 3) install high-flow cats, do a central silencer/muffler delete and straight pipe from the cats to the left and right mufflers Has anybody ever done anything like options 2 or 3? If so, what were the results? Obviously, the car will be a lot louder, but any thoughts on how this effect the car's value or performance? Also, does anyone have any ideas about how much these options differ from one another in regards to cost?