Some simple history.

E36 makes too much power in a full build.

PCAs are implemented.

E36 is discussed by ITAC (and CR, weight is discussed, and the SIR is suggested. ITAC is interested, but recommends weight.

CRB decides on a 27mm as recommended by computer simulations or other modeling done by Raetech, one of three vendors.

The sizing is questioned, there is some discussion and it is decided that real world testing needs to be done.

Testing commences, in a number of locations with a number of different cars. Unfortunatley, one car isn't a valid data point as it's not running correctly and hasn't been broken in, and another never materializes. Which limits data points.

The results are discussed again, and while the ITAC again likes some aspects of the SIR, it recommends weight.

The CRB decides on the 29mm SIR, but moves the implementation date back a month.

Those are the highpoints.