new exhausts always have a 'break-in' period when they smell funny.
Give it about a week or so and it should go away.
It'll go away sooner if you drive a lot.
You may have just not noticed it before w/ the megan piece because it was only axle-back. Youve got a lot more piping now to make the smell.
Dont worry about it.
If youre really paranoid you can check the bumper after every drive to look for melting...but its probably ok
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