Originally Posted by mach0415

Hey all,
I have a 1985 300SD and it has over 400K miles. The OM617 is starting to get tired, but is still fairly reliable. I have had the car for 8 years and have grown attached to it. I am considering rebuilding the engine or finding a lower miles 617 to throw in it, but if I can get better power for the same price it makes sense to go that route. So, is there an engine that will go in a W126 that will throw me back in the seat that can be built for performance as well?