Unless they swapped in an injection pump off a 617 turbo, it's not doing a thing but pumping in some extra air.

Keep the boost under 7 psi and you will be OK, I think. Won't get a whole lot more power, either.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!