This method is the cat's @$$, and it's the best system ever invented to repair blind bolts. These are designed specifically for high stress applcation, and you could install a chin-up bar with it, so an exaust system would be a light duty job.

The top and bottom are the tool that holds the fastener in place. The top shows the slot that holds the fastner, and the bottom shows the fastener loaded in the tool.



The inside is the fastners, one before crush and one after crush.

With the fastener inserted in the hole, you tighten the bolt, and the fastener crushes in place.

This would take quite a bit of force to rip out the metal behind, and the fastner is made of steel, not aluminun.