Looks like that first design was really a test piece.
http://www.autosport.com/news/report.php/id/85466
pressure taps could be those little taps under the exhaust tip."The data that I saw from P1, albeit wet, was that the main peak airflow, the gas flow from the exhaust, temperatures, the performance, and the pressure tapping velocities were what we expected them to be.
"So unless something else has come to fruition, which I don't think it has, we should have the confidence that this floor will do everything we expected it to or most of what we expected it to."