I just did mine not too long ago. Did it all by myself (on a lift) and it took all of about 4.5 hours (with cleanup). I am very happy with the loudest damn Z east of the mississippi and I love the smell as well. Trying to figure out a tune solution so I can make the CEL go away.. I drove it 10 hours to NC and noticed that when the CEL was thrown it actually idles correctly as opposed to idling at 700rpms.
My short start up and idle video right after install.