These forged connecting rods are capable of over 150 HP per cylinder. They are built with high quality 4340 chrome moly steel. H-beam design greatly increases strength and durability over stock rods. Magnaflux inspected. Multi-stage heat treated for increased stability. Honed to exact tolerances.
 
These con-rods will fit the OM601 2.2L, OM602 2.5L, OM603 3.0L, OM604 2.2L, OM605 and OM606 engines with 26mm wrist. 
You'll need:
-Crankshaft from 2.3 (4 cylinder), 2.9 (5 cylinder) or 3.5 (6 cylinder)
-89mm pistons from the OM604.910 or OM604.912 
-Oil squiters from the NA engines 
Those engines displacement is increased from 2.2L to 2.3L, 2.5 to 2.9 and 3.0 to 3.5. 
High strength 7/16" bolts are included, which should be torqued to 70 Nm. 
Each purchase is for one rod and two bolts.