It is organised by Speedworld and sanctioned by the Royal Automobile Club Belgium.
Most meetings consist of two 90-minute heats, with an additional 12-hour race at Circuit de Spa-Francorchamps.
The Silhoutte classes, S1 and S2, include cars such as the Renault Mégane Trophy, GC Automobile GC-10 V8, Peugeot 406 Silhouette, Peugeot 407 Silhouette, and Volvo S60 BTCS.
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