My 2010 Element had its catalytic converter stolen in the dealer's lot while the car was there for other repairs. The converter was replaced, and I picked the car up yesterday. While I was driving home (the first 20 miles or so was on the interstate; total trip is about 45 minutes/ 30+ miles), there was a strong smell, somewhat like exhaust, but I think "sharper". The engine or exhaust also sounded a bit more noisy than usual, I think, though not as loud as it was without the converter. Is that normal? It was a very cold day (14°F dropping to 8°F).