Have you noticed a different sound to the engine? Have you noticed (almost imperceptible) new vibrations when accelerating or decelerating rapidly? A very deep noise like Barry White singing in the background?
If yes, definitely exhaust.
I vouch for Calgary Muffler. They're across from Chinook in the Johnny Rocket parking lot.
But before you take your car anywhere, call a bunch of places and describe the problem and ask for estimates. You'll be able to narrow it down better.
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