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NVH refinement has gained increased importance in the automotive industry especially in the last two decades, due to increased global competition and customer requirements. Furthermore, owing to the stringent legislative requirements on the radiated noise levels have also put additional demands on the automotive industry from the NVH perspective. Engineers have been constantly focusing on improving NVH evaluation techniques and test methodologies to improve the quality of test data, ease of measurement and productivity. The traditional input/output technique based modal analysis has always been an NVH engineer's favorite tool, for identifying the dynamic behavior of the component / BIW / vehicle in whole. The knowledge of a structure's modes and mode shape gives sufficient information of the component with respect to the system's modal alignment, for further optimization of performance, weight and for updating the CAE model.