How To: Isolate Exhaust from frame cutouts?

[BANKO]

I like how AME frames have nice exhaust pass-throughs for 3" exhaust tubing.

http://artmorrison.com/maxg.php

I was wondering how you guys have mounted your exhaust to prevent rubbing and vibrational noise to the frame when using these cutouts. I'm assuming you could do this by rigidly mounting the exhaust to the frame just behind the cut-out or using a high-temp elastomer as a damper.