One problem related to engine exhaust system has been reported for the 2005 Mazda RX8. The most recently reported issues are listed below.
2005 Mazda Rx8 quits running and will not restart -removed spark plugs cleaned and started-quit before got home same problem. Don't kill engine unless above 3000 rpm or engine is warm. Engine quit replaced spark coil quit before got home was told catalytic converter defective and will damage muffler. Car was towed each time to Mazda dealership. Now they claim needs new engine.