Got the Dynomax box via UPS yesterday and it was missing tailpipe and pipe between the Y and the muffler!.
Went to my local Muffler guy and he welded it all on, built the missing hangers, built a better tailpipe and we tossed the clamps. $68 later I'm up and running.
Check your box when it comes for missing parts. Dynomax is not open on Saturdays for questions regarding missing parts.