I watched some old Super Tourers racing last year at Silverstone, I cant recall the exact series, but it had a 1998 Vectra, 1997 Primera, 1995 Cavalier and a 1998 Mondeo I believe. But I could tell having been to dozens of BTCC races that these cars weren't revving as highly, or cornering as quick as the works cars did, I assumed the cheaper tyres and slight de-tune on the engine was the cause.
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