The bonnet insulation will not only reduce the noise of the engine, but also accelerate it during the cold time of the year. Noise isolation units are installed in the inner part of the bonnet. Installation locations need to be degreasing. Then it was necessary to make a leukaIy from newspaper sheets that would cut sheets of noise-proofing material. Before the lake, you need to warm up the internal part of the Opel Astra J drier. Incled sheets of noise-proofing material need to be skated with a paint roller.
