I took apart the trunk today to see how the car would sound with the exhaust fuse pulled. Didn't sound much different. After some checking the flapper valves behind the mufflers to see if they worked I found the vacuum hose was off on the driver's side. No wonder there wasn't a difference. Guess ?I've been driving with one side open all the time. Wonder if a tech was playing with it during PDI and forgot to plug it back together.