Hmm, P&M tubeframe-chassis and V8. Looks like P&M are recycling their GXP.R-concept from Rolex GT. Although those are indeed a bit pricier than S2000 cars with ~300k USD when new. Maybe a simplified version of those?
Belgium has a modestly successfull silouette-class as well in the BTCS. I think they get around 7-8 cars in their headlining S1-class. Mostly cars from former French Supertourisme and Renault Megane Trophy there.
With Mags being a Corvette-factory driver, it's no surprise that they choose P&M.