The 904 was a car built during the end of an era having affordable race cars. Every day Porsche produced one 904 and a corresponding customer was more than willing to buy it. Future plastic-bodied cars, beyond the 904, would soon become to advanced and expensive to sell as a production vehicles. Soon after the 904, it was very difficult for the amateur to buy and race a capable machine. The 904 started a trend which would motivate Porsche to manufacture sports prototype cars.