Since we all have to re-run all of our TT's, I'm creating this topic to give the forum a place to comment on the experience. Specifically, (1) how do your new times compare with your old times, and (2) do particular cars seem to act differently? 

As has been noted, the first time you rerun an event you get to compete against yourself.  

Re-ran Brands Hatch in the Lambo Murc and almost matched by previous time. Very cool to find myself ranked 53 in Group I.  Of course, as time passes, I expect all of my nice new times to slowly slide downhill towards the dreaded Group L.