770 HP Audi quattro S1 Group B - a monster by Prospeed Bulgaria

This fantastic video is made by Emil Iliev For further details about the car check this site: http://prospeed.bg/en/home

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just having fun in this vid 93octane pump gas 20 psi 512WHP or 640hp on a motor ;D with c16 and 30psi car made 650+whp