As was mentioned....plug the Vacuum Line with a "Golf Tee".....but that is a bit obvious......you can also insert a "BB" into the Vacuum connector and then hook it back up for the "Stealth" version, and accomplish the same thing...ot if you are really adventurous you can send a message to the moderator Brian Carlton, and purchase his "EGR Test Kit"...wink, wink.....and remove the EGR completely.....it cleans up the engine's appearance, and there is no chance of any exhaust leaking into the intake.....

The results aren't all that obvious, but they do eliminate the hot exhaust gas from entering the intake......there is an increase in efficiency......

SB

Note: I do not carry a "Carlton Engineering" sponsorship logo on my car....but...I have installed his "EGR Test Kit" and have found it to be easily installed, and "in my opinion" it does clean up the look of the OM 617.9xx....also it is well worth the money......

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Diesels:
'85 300D, "Max, Blue Benz", 155K, 27.0 MPG
'84 190D 2.2, "Eva, Brown Benz", 142K, 40.2 MPG
'77 240D (parts car)
'67 Eicher ES 202 Tractor "Otto" (2cyl, Air Cooled, 30HP)
Gassers:
'94 Ford F-150, "Henry", 170K (300 Six) 17.5 MPG
'85 190E 2.3, 148K....Parts Car
'58 Dodge W300M Powerwagon (Flat Fenders) Less than 10 MPG