EGR- Exhaust Gas Recirculation Valve.

Its only on turbo model w123's not sold in australia (once again john needs to listen to his potential customers).

it is ILLEGAL to remove an EGR or to block it. Altough it is a very popular mod to do.
basically the valve feeds exhaust gas back into the intake for emmisions reductions (also performance)

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Cheers
Nick.

Roidio 2001 Holden Rodeo 4x4 2.8L TD. 2.5" Straight through exhaust sytem, heat exchanger shower system. 2" Body Lift,
And lots of fruit, B100 for 25,000 no problems.

Elsa 1983 Mercedes-Benz W123 300D. The Fastest Merc in Oz, Loving B100 Burgers