I know in the us they have different classes , Scott Kelly and Doug gonzales are best competitors at this time . doug races in SS/VX for example and set a new record at Phoenix of 10,9.. They run superstreet cars with smaller engines . Most original modyfied parts. that makes it a little cheaper and like Thorsten sayed it takes more experience and knowledgement to make those engines fast. That is very interesting . A Superstreet engine for a beetle costs about 25000-30000 euros. An engine like that would be from 15000 up :-)
I will look for the rules ...
Udo