Charge Air Pipe.
A pipe that transfers compressed air to from the turbo or super charger to the intercooler.

CHARGE AIR PIPE

Variant code: CD02.
Turbocharger Intercooler Tube
If your 2016 Volvo XC90 is equipped with a turbo and you've noticed a reduction in acceleration or a hissing on acceleration accompanying your check engine light, your intercooler or its piping/tubes may need to be repaired or replaced.