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Exhaust system noise has significant impact on vehicle exterior and interior noise. In a vehicle development, during early design verification phase, the exhaust tailpipe orifice noise performance is measured and validated at the proving ground tracks using design intent prototype parts developed and delivered by supplier, following previously technical specifications agreements and specific package constrains and targets. At late design verification phase, new measurements are performed in production intent prototype parts, and the results achieved are compared with initial measurements made for design intent prototype parts - with conflicting results in some situations.

Masking effect can be considered as the sound decrease in audibility when another sound called masker is present. Vehicle Wind Noise attribute is facing with several components contributors which present masking effect. The purpose of this paper is illustrate this phenomenon.