It was more to do with the German spec cars running different suspension tweeks which wasnt allowed in the BTCC version,but gave the German spec cars that extra performance. From the start the british cars were a step behind the STW version.
Supertouring go so complicated with different homologations it is what lead to a complete change of regs for the BTCC,
Now the Touring car licence being introduced for the BTCC will end up holding more value than some of the cars now they all fall into common components regulations !
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