I ran those for months in a tired OM617.912 without any other modifications and it ran fine except for a lopey idle at times because I put in a 2:65 LSD with the five speed manual transmission. In 5th gear I was just south of 110 mph and still had plenty of rack (throttle). Because of a front end odd vibration and my own fear of the cops I backed off. When the time and place is right I will put on the correct tires rated for much higher speeds with an entirely rebuilt front end to see what happens if I bury the pedal with a turbo OM617 mated to a five speed manual transmission and same 2:65