TMZ broke a story in December ... Porsche had issued a memo to its dealers 9 years ago warning them the 2004 Porsche Carrera GT could be dangerous to an untrained driver. The memo says the road surfaces need to be smooth, like a race track. The car is so sensitive, the memo says, "This vehicle cannot drive over a Foster beer can that is lying on its side."
They also said an after-market exhaust system had been installed, which would have increased the engine"s horsepower. According to investigators, the coroner"s office determined neither Walker nor Rodas had alcohol or drugs in his system at the time of the crash.
During the investigation, German Porsche mechanics flew to L.A. to examine the car .... analyzing the Carrera GT"s brakes, engine, body and a tire that wasn"t destroyed in the fire.