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To put it in a Euro-sense, Prep levels for GA-GT cars fall somewhere in between GT3 and GT4. The Porsches are essentially 911 GT3 cup cars with a few mods, and the Ferraris and Audis are modifed GT3 builds with reduced aero and no traction aides. There's still a handful of tube framed or "prep 2" class cars, but the overall trend seems to be shifting over towards the Unibody GT3-ish spec cars. If you were watching Daytona, The M3s are a tube chassis car running an S62 V8 out of the E39 M5, The RX8 is a tuber with a 20b naturally aspirated rotary out of the JDM Cosmo, and the lone Camaro runs an LS2 based motor. The Viper is a unibody car based off of the Generation 2 competition coupe.
Traction control and ABS are not allowed in the GA-GT class, and they run on a spec Continental (nee Hoosier) tire.
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