Larz,

It took me no more than 15 minutes to replace mine. Remove the air filter, disconnect the EHA wire connection, unscrew two alen screws, remove old EHA, replace 2 green o-rings, screw in new EHA - don't over tighten, reconnect the wires, reinstall the air filter.

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Riadh
'89 560SL Rauchsilber
And what is good, Phaedrus, and what is not good -- Need we ask anyone to tell us these things?