Porsche. The sole claim against Porsche was that the CGT was defective because it was designed without electronic stability control, which Porsche calls PSM. McClellan deposed two German engineers on the subject, and their answers were inconsistent. One testified that Porsche did not think that its PSM system would work on the CGT because the car's frame structure and suspension mountings would create strong vibrations that would interfere with its operation. The other engineer testified that PSM was not offered because the customers didn't want it.
McClellan suspects it was a marketing decision, as the CGT was marketed as a "race car for the streets," and race cars don't have electronic stability control. He notes that during its development, the CGT had exhibited a tendency to oversteer during high lateral acceleration. Porsche made some adjustments, but did not fully correct the problem, which explained why the mechanic who drove Keaton's car reported "handling problems." PSM would have corrected the "tail happy" oversteer response to Keaton's steering input to avoid the Ferrari.
