Our billet aluminum connector bolts right up to the stock OM606 boost pipe and manifold found in the 98 to 99 E300 W210. 
 
Comes with two threaded ports for 1/8 NPT fittings to connect a boost gauge, MAP sensor, ALDA, etc...
 
Notice that this is installed where your EGR would normally go. Be sure your build and local laws don't require an EGR.