Noise insulation element for the front wall of a vehicle body with - a mass spring element which has a plastic support layer with a front side facing away from the front wall when the mass spring element is in an installed state, as well as with a rear side facing towards the front wall and a noise damping layer made from a noise damping material connected to the rear side of the plastic support layer, - wherein the support layer has a recess on its rear side and an integrally designed hollow fixing projection (16, 16'), - wherein the fixing projection (16, 16') has a bottom wall and a side wall rising up from the bottom wall, - wherein the side wall extends along the recess of the support layer and has an outer receiving groove for receiving an opening edge of a receiving opening formed in the vehicle body for the fixing projection, - wherein - the bottom wall of the fixing projection (16, 16') has a bottom wall opening which extends into at least one part of at least two sections being opposite to each other of the side wall of the fixing projection (16, 16'), or - the bottom wall in the plane formed by the same and the side wall of the fixing projection (16, 16') is designed to be compressible in at least two sections being opposite to each other, - wherein the bottom wall of the fixing projection (16, 16') has a bottom wall opening which extends into at least two sections being opposite to each other of the side wall of the fixing projection (16, 16'), - wherein the bottom wall opening of the fixing projection (16, 16') defines by the mass spring element a line recess being delimited by a recess edge for the passage of a line, in particular a hydraulic and/or electric line and - wherein the recess edge of the line recess is provided for being applied at a line and therefore maintaining the form and stabilizing the bottom wall opening and the line recesses thereof. - a mass spring element which has a plastic support layer with a front side facing away from the front wall when the mass spring element is in an installed state, as well as with a rear side facing towards the front wall and a noise damping layer made from a noise damping material connected to the rear side of the plastic support layer, - wherein the support layer has a recess on its rear side and an integrally designed hollow fixing projection (16, 16'), - wherein the fixing projection (16, 16') has a bottom wall and a side wall rising up from the bottom wall, - wherein the side wall extends along the recess of the support layer and has an outer receiving groove for receiving an opening edge of a receiving opening formed in the vehicle body for the fixing projection, - wherein - the bottom wall of the fixing projection (16, 16') has a bottom wall opening which extends into at least one part of at least two sections being opposite to each other of the side wall of the fixing projection (16, 16'), or - the bottom wall in the plane formed by the same and the side wall of the fixing projection (16, 16') is designed to be compressible in at least two sections being opposite to each other, - the bottom wall of the fixing projection (16, 16') has a bottom wall opening which extends into at least one part of at least two sections being opposite to each other of the side wall of the fixing projection (16, 16'), or - the bottom wall in the plane formed by the same and the side wall of the fixing projection (16, 16') is designed to be compressible in at least two sections being opposite to each other, - wherein the bottom wall of the fixing projection (16, 16') has a bottom wall opening which extends into at least two sections being opposite to each other of the side wall of the fixing projection (16, 16'), - wherein the bottom wall opening of the fixing projection (16, 16') defines by the mass spring element a line recess being delimited by a recess edge for the passage of a line, in particular a hydraulic and/or electric line and - wherein the recess edge of the line recess is provided for being applied at a line and therefore maintaining the form and stabilizing the bottom wall opening and the line recesses thereof.