of Sebring, the category would compete for the remainder of the season in non-Championship rounds, with no more than four cars entering each race. In 1994 Camel was replaced by Exxon as the title sponsor. However, as the WSC cars took over as the leading category, their reliability would be tested at the opening round at the 24 Hours of Daytona. Two cars started on the front row, with eight WSC cars competing. Two cars finished the race, with the leading WSC car finishing ninth behind GT cars. A WSC car would score its first podium finish at Sebring with a second, and third place behind a Daytona winning GTS class Nissan 300ZX. That led to a rule change for the latter category, as they would be barred from using engines that were originally for GTP cars. At the inaugural round for WSC cars at Road Atlanta, the new Ferrari 333 SP would make its debut amongst mass media fanfare, and win its debut race. The car brand regularly achieving podium finishes every round after that, Oldsmobile, won the manufacturer's title over Ferrari by four points. In 1995, a new rival for Ferrari appeared in the Riley & Scott Mk III. The car would make its debut at Daytona, but would retire after the eleventh lap due to engine failure. Ferrari would help the category score an overall win at the 12 Hours of Sebring, and would take the manufacturer's title. The Ferrari 333 SP and the R&S cars (Oldsmobile / Ford) were the dominant entries in the series from 1995 until the demise of IMSA at the end of 1998. In 1996, Slater sold the organization to Roberto Muller (ex-CEO of Reebok) and Wall Street financier Andy Evans, who was also an IndyCar owner, and owner-driver of the Scandia WSC team. Evans and VP of marketing Kurtis Eide were responsible for the name change to Professional Sports Car Racing. In 1992, the long running category American Challenge stepped into the GT series. It became known as the GTO category when the former GTO category was renamed GTS (Grand Touring Supreme). The move was prompted by sponsor Exxon, who wanted the series named after its sub-brand of fuel. In 1995, in a bid to move closer to the European BPR Global GT Series, the GT category would undergo another major reformatting. GTS became known as GTS-1, and GTU became known