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Old 05-22-2009, 11:58 AM
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DeliveryValve DeliveryValve is offline
Chairman of my Benz
 
Join Date: Jun 2006
Location: Central California
Posts: 4,135
Yes. Air Recirculating Valve. It is that growth on the front housing of the turbo with a vacuum line attached to it. The function is to lower boost pressure so that the exhaust backpressure is higher and more exhaust flows through the EGR.

I tried looking for pic, but don't have one available.
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