Were the cars in fast furious real or custom built?

The only verified source supplied discusses the 2006 animated film Cars, which features anthropomorphic vehicles in a fictional setting. It lists its director, cast, and plot, but contains no details about the Fast & Furious series or the production of its vehicles. Because the evidence does not mention Fast & Furious, we cannot confirm whether the cars in that franchise are real or custom built based on the information given.