[SCOTI]

This is how I set-up mine so the exhaust tubing can move fore/aft as it grows w/the heat:

In the 1st pic, the white line is the hard-mounted hanger bracket attached to the frame. There is a SS bolt that attaches to it w/the head cut off so it's just a stud (red line). The isolation bushing is attached to the exhaust tubing. As the exhaust grows/stretches in length, that bushing can move on the stud as needed.

The 2nd pic is similar in function but reversed for the need. The isolation bushing is bolted to the x-member & the tubing support hanger welded to the exhaust goes through it & has the ability to move fore/aft.

It prob isn't a big deal, but it can put stress on thinner/weak areas of the remainder of the system & cause stress/flex cracking. Something to keep an eye on & to consider on your next build.