I'm now offering a EGR Valve removal kit for a 5 cylinder Mercedes Diesel Turbo. This will eliminate the EGR valve. "For Testing Purposes" Cost $25 in the U.S. (if the Austrialian fellows would be interested I'll check on shipping and give you a solid price)Paypal to Jonthecarguy@comcast.net
Kit Includes the following:
3/16" 304 Stainless EGR Intake Flange
1/16 304 Stainless Exaust cap
700 Degree Intake Flange Gasket
2 Bolts for Intake Flange to remove original
Copper High Temp Sealant to seal exaust cap

I have designed the stainless exaust cap with the pressurized device to ensure proper seal. See picture Below (kit doesn't come with air fitting device)