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This paper presents the propshaft liner development that is expanded from previously published SAE technical paper and US patents. The new developments will expand in two facets: liner tuning adjustment and refinement, along with the implications to and solutions for broadband attenuation. Methods for developing a liner with higher tuning adjustment capability will be discussed, along with the results for a design-of-experiments study. In addition, concerns are explored and addressed of broadband attenuation in balancing the tuning effectiveness for particularly targeted frequency range. A particular application of the newly developed liner, trade-marked as Sylent liner, was illustrated and discussed in detail.