• James Tapp

What is the difference between Prostock and Modified Racing Classes?

We run two different championships on the UK ThunderCat racing circuit. One is known as P750 and the other is known as P750 Modified. But for the uninitiated, what is the difference between each category of racing. Here we explain the differences:

Both P750 and Modified classes have an issued homologation document, showing the measurements for a standard stock engine. A P750 engine can be blue printed to the standard manufacturers homologation as approved by the UIM. A modified engine can be taken further, but all modifications need to be within the remit of the rule book.

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