Recently had my engine rebuilt after the dreaded time chain tensioner fault

Here is a quick link to the sound recording...
http://picosong.com/adhu/
Sounds like it is coming from the exhaust. The recording was taken from below the drivers door.
Every little noise makes me worry now as I had wish I had taken notice of the slight rattle for a couple of secs when starting. If only I had that checked out or checked on here, I might have avoided the engine damage

Thanks in advance for your help.