Flowmaster Scraping Normal?

It's probably not the mufflers scraping the ground. It's most likely the tailpipes rubbing on the control arms as they go over the axle. You'll just need to adjust the cat-back slightly
 
My guess is that your pipes/mufflers are scraping part of the body of the car. My flowmasters rubbed both my brake lines and fit HORRIBLY between the axel/edge of the car/control arms. I had to take it to a shop to get it aligned properly because the fit was so bad.
 
My guess is that your pipes/mufflers are scraping part of the body of the car. My flowmasters rubbed both my brake lines and fit HORRIBLY between the axel/edge of the car/control arms. I had to take it to a shop to get it aligned properly because the fit was so bad.

Yea the fit is TERRIBLE. I have a flat spot on both tail pipes from rubbing on the axle tubes.