Porsche's only model eligible for the GTD category is the new GT America, which will make its competition debut at the Rolex 24.
Nine cars were at the Daytona test, with up to a dozen expected for January's event.
"I like everything about it," said Madison Snow, driver of the No. 58 Snow Racing/Wright Motorsports/JDX entry. "It's a lot cleaner and smoother, and the paddle shifting is super. The dashboard is different, but you get a lot more information out of it. It's a great car."
BMW Z4 - After years of running a BMW M3 in Rolex Series GT competition, Turner Motorsport is testing the BMW Z4 it will race in the GTD class in 2014.
Paul Dalla Lana, Dane Cameron and Pedro Lamy tested the car at Daytona.
"We're going to look at the data and see what it says," team owner Will Turner said.
"The consensus is this car is a little easier to drive than the M3, but we're still coming to grips with the balance."
SRT Viper GT3R - In addition to preparing the two SRT Motorsports Viper GTS-Rs in GTLM competition, Riley Motorsports is also fielding a Viper GT3-R for GTD competition.
Ford EcoBoost/Riley - The new Ford EcoBoost/Riley made a splash at Daytona International Speedway in October before its first official IMSA outing.
Colin Braun drove a turbocharged DP prepared by Michael Shank Racing to a lap of 222.971 mph – the fastest lap ever recorded on the famed 2.5-mile oval.
"The new turbo changes everything," Negri said. "We have to learn about the lag on the turbo and how it comes on, but it's been a lot better than expected."