I will try the speed tests today. My 300TD is the famous 1985 model with the crap oxidizer that was a recall because it would trap too much crap and clog. I had the exhaust manifold replaced and the turbo to and earlier pre-trap oxidizer version. That made a world of difference in the acceleration and power. Also I was worried the trap oxidizer could have damaged the turbo because I have heard stories about the ceramic element sand blasting the turbo as it breaks down with age.
Thanks for the replies