Auto Classics International / ACI (United States) - AllCarIndex

Auto Classics International (ACI) was an American automotive manufacturer active from approximately 1994 to 1996, with operations based in Tempe, Arizona, and later in Hawaiian Gardens, California. The company specialized in producing replicas of classic racing cars, most notably the ACI Rennsport 550, which was modeled after the Porsche 550 Spyder.

The ACI Rennsport 550 featured a round tube space-frame chassis and was powered by Volkswagen engines ranging from 1600cc to 2400cc. The standard suspension system utilized components from Volkswagen, although customers had the option to select custom-fabricated parts for enhanced performance. ACI offered its vehicles in both kit form and as fully assembled units, catering to a range of enthusiasts and builders.

In 1995, ACI relocated its operations from Arizona to California. Following its closure, the rights to the kit were acquired by Vintage Spyders, which continued to offer similar products to the market.