The manufacturer of any vehicle subject to Section 9980 shall affix a prominent label to the vehicle stating that the engine in the vehicle may have been manufactured by another manufacturer. The label shall be located on or adjacent to the window sticker identifying the manufacturer’s suggested retail price for the vehicle or, if none, it shall be located on or adjacent to the window sticker identifying the equipment provided with the vehicle. This label, however, is not required if the manufacturer of the engine contained in the vehicle is disclosed in sales literature or is noted in the sales contract.