I always look at what someone has to pay for a used M3. Then compare this to what a used SRT cost today. When you do this the XF always comes out a winner!
I just got mine in May and for the money this is the best performing car I have owned. Can't wait for a few mods to make it even better.
Good luck with your race. He will have the advantage of less weight since his wallet has less money
Jake80