Join Date: Mar 2002
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Re: name this part
Sounds like you are talking about the EGR tube - "Exhaust Gas Recirculation".
The one on my old 258 didn't route under the engine, it just came off the header as a quick elbow to the EGR valve that sat right beneath the intake manifold. But I can't imagine too many other things that come off the exhaust, go through a valve, and route to the intake.