"I've sent pumps to him for PERFORMANCE TWEAKING, which would BURN THE TIRES OFF a 300DT without any BOOST MODIFICATIONS ! ! !"

Would love to know how. Simply sending more fuel to the motor is not sufficient. What do you think all that black smoke coming from the tailpipe is when you've turned your ALDA too high? It's unburnt fuel.

Please elaborate.

BTW....the 'hearsay" you refer to comes from EX- multi-decade experienced MBZ mechanics. Not exactly your run-of-the-mill backyard DIY'ers.

Chris
'85 300SD