Additionally, the factory Porsche tubs seemed to loose torsional stiffness over time due to how they were initially bonded at the factory.  The factory tubs were riveted and then bonded together with a tape adhesive that needed to be oven cured.  Story goes that Porsche would fabricate X-number of tubs and then oven cure a entire run.  So the first tubs fabricated in a given time period sat until an entire run was ready for the oven. The adhesive's out-life was such that the tubs that waited the longest before heat curing were the ones that degraded the quickest. The resin in the adhesive essentially began to cure out as the tubs sat waiting to head into the oven thus reducing the adhesion characteristics when they did finally see heat.

Yagami indicated that the DR2's development did not benefit from wind tunnel testing.