Abstract: A mechanism and method for stabilizing vibrations in vertical exhaust systems for over highway trucks. A mass-spring absorber having a natural frequency that corresponds to the natural frequency of the vertical exhaust system, which we are trying to stabilize, is secured to the vertical exhaust system. The mass-spring absorber dampens the natural frequency of the exhaust system and creates an anti-resonance to the offending resonance frequency. The mass of the spring-mass system has a generally toroidal shape such that it surrounds the vertical exhaust stanchion and is connected thereto by a spring or springs. The mass of the toroidal shaped absorber is maximized, which results in maximum separation between the new natural frequencies of the vertical exhaust system, while at the same time the damping between the vertical exhaust system and the toroidal shaped absorber is minimized.