Thanks Barrett, I see the D shape, just haven't started surgery on mine yet to notice it. Cooter, I struggle with the urge to install a D&D, Drummer (do they still make them?) or other aftermarket muffler, but, I'm certain that I will want the quiet and torquey stock one back. I expect that there is a trade-off for the smooth power of stock and the cool loud but more top end power of aftermarket. This actuator malfunction has revealed to me how well the stock system works...when it works that is.