Not sure how many of you S550 guys autocross, but I saw some Bullitts last week at Tobay Beach with the Metro PCA guys. In case anyone is interested, there's one last autocross tomorrow.
http://metronypca.org/Autocross-Nov-12-2017
This is what we do on the Focus ST with big turbos. The DI runs out of fuel around 370-380whp, so we add PI for more headroom. Good enough to get me to 440whp, and others much more.