I am not sure what this has to do with Grand-Am and the 24 hours of Daytona as the ALMS is a completely separate entity, but there have been 2 ALMS models released, both by Revell. The Audi R10 TDI, and Corvette C6.R. Granted they are marketed as 24 Heures de Mans kits, there are ALMS decals available, plus the same exact cars run in the ALMS. Unfortunately Tamiya have all but stopped producing racing cars save for JGTC Toyota's and Honda's. A Porsche RS Spyder would probably be their best bet given Tamiya's history of producing Porsches. As for Grand-Am, the following just isn't there based on the fact that it's nearly a domestic series with very minor manufacturer support. It wouldn't be in Tamiya or even Revell's best interest to produce a Grand-Am kit. but I wouldn't hold my breath for a new racing car kit from Tamiya other than a JGTC...