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Doing this will result in less engine noise inside the car. Product used: soundproofing blanket, 10mm thick. For use inside the car, it does not need to have an adhesive side. If you are going to place it under the car's original carpet, then it also does not need to have a bitumen side. Without adhesive and without bitumen, the blanket has a lower price. I bought the blanket on the Mercado Livre website. I DO NOT RECOMMEND THE SELLER. Car in the video: Renault Kwid. #moreeconomicalcar #economical #fuelsaving