In today’s automotive world EV segment is emerging continuously. EV major noise sources are tire, motor and aerodynamic noises etc. At high speeds wheel-road noise dominates as wheel-road noise level increases with vehicle speed. It is required to design acoustic wheel arch liners for tire noise reduction. Considering the criticality in overall EV noise reduction, optimization of acoustic performance of wheel arch liner is essential which requires precise evaluation in terms of sound absorption and mounting with air gap from body panel to reduce tire noise. This paper discusses about the extensive study done to develop the methodology for step by step evaluation of sound absorption of wheel arch liner at design stage (flat form), along with air gap and actual molded part in Autoneum make Alpha cabin. BIOT’s properties of flat and molded wheel arch materials evaluated using specialized test rigs in terms of AFR, Porosity, Tortuosity, VCL, TCL etc. Different types of wheel arch liners have been evaluated and effect of different parameters like sample construction, mounting, air gap behind with body panels, fiber structure of sample has been studied. Parametric study has been done using BIOT’s properties to tune the wheel arch liner absorption performance.