It shall be unlawful to engage in a motor vehicle race or contest for speed on any public road, street or highway in this State or to aid, abet or assist in any manner whatsoever in any such race or contest. Altering, changing, tampering with or "souping up" a motor vehicle for the purpose of racing or speeding on any public road, street or highway in this State shall be considered as aiding, abetting or assisting for the purposes of §§ 56-5-1590 to 56-5-1620.