Pncs
PNCS is pirelli noise cancelling system.
Very similar to Michelin 'Acoustic'.
It is a foam insert to reduce tyre roar.
It helps a bit and at certain frequencies. Volvo have started using it on many SPA platform cars even though the tyres are more expensive.
Volvo have even worked with Michelin and Pirelli to develop these tyres (hence the VOL) to mark them as specific to Volvo.
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