Last Tuesday, my timing belt sheered off several teeth. I got one on order and replaced it, and the car fired right up. I was able to hand crank the engine several times after re-timing it and it turned without any sort of binding/difficulty beyond fighting the springs.
Now, I've noticed while driving it, it sounds much deeper at the exhaust end of things. I didn't actually take apart anything along the airflow path. I just took out the spark plugs (so I wouldn't fight compression when hand cranking it) and the serpentine/timing belts.
So my question is, why would replacing the timing belt (and tensioner/pulleys/water pump) change the sound of the engine? Is it possible a worn out tensioner could be the culprit here, or perhaps a stretched belt?