Exhaust question (3 Viewers)

[gowyn]

Just poking around underneath and saw the crack in the muffler with white powder around the edge. Never seen before, anything to worry about? No leaks.

 

[Rednexus]

Your muffler is blown out. I'm not sure what the powder is - the OEM Lexus muffler is chambered inside. Perhaps the remains of a past repair? Regardless, you should get a new muffler as that will continue to get worse (e.g., loud with leaking exhaust gasses). A muffler shop could fix it easily with a generic aftermarket muffler.