We always love hearing back from customers (or professional installers in this case) and sharing their results. Nothing beats real world testing of great American made noise & heat insulation products. Bruce at HCA has some awesome data he shared with us via email and we are passing it along. Using Damplifier Pro to clean up the structure borne sound in his clients Mitsubishi Evo has greatly decreased the noise level which will greatly increase the amount of music you are able to hear or just to enjoy a more quiet trip down the road on daily commutes. Always insist on high quality American made sound insulation products....Second Skin For The Win!!!