Passenger side muffler is slightly plugged.
To test the above theory......
Go to the store and buy two "Eastern Washington" condoms. (These are the super large size.)
Place one on each tailpipe and hose clamp them in place.
Get movie camera, set it on tripod, aim towards rear of car so it can tape both tail pipes with condoms, start camera.
Start engine.
Send tape to "America's Funniest Home Videos" so we can all see the results.
AFTER THE TEST THE CONDOMS WILL NO LONGER BE USABLE .... BUT YOU CAN TAKE THEM TO WORK AND SIMPLY SAY,
LOOK WHAT I DID !!