The restrictions were off the Callaway GT3 when the Cadillac program was shut down.
They haven't done much here themselves because they don't have the money to, with the PWC program getting cut back multiple times until it was axed and the cars they said they would have at the COTA 24hr never showed up.
It is cleared to run in IMSA as a GM product, meaning that Callaway doesn't have to pay the manufacturer fee. Still wouldn't expect to see it though, GT3 is too full of factory-built cars with factory pressure helping ensure the BoP isn't too awful, huge databooks, and lots of support options for a team to spend money on a relatively unproven car from an independent team with little North American infrastructure.
