Recirculation Valve for BMW N13 1.6 Turbo Volkswagen > Passat > 1.8T The boost pipes are a

The boost pipes are a direct replacement to the original hot-side charge pipe which is rather restrictive especially at the turbo end

when the throttle valve closes

and you’ll find plastic OEM inlet hose has ribs and steps within the bore causing turbulence and disturbing the airflow

For recent 1

Recirculation Valve for BMW N13 1.6 Turbo Volkswagen > Passat > 1.8T The boost pipes are aWe recommend servicing your valve every 3 years, or 20,000 miles, whichever comes sooner This recirculation valve, is for the BMW N13 1. 6 Turbo engines that have the electronically controlled bypass valve. This engine can be found in the F20 F21 and F30 chassis badged as 114i,116i,118i and 120i and 316i and 318i It is recommended for any vehicle where the boost pressure has been increased by an ECU software upgrade and for unmodified vehicles