You should install the factory one with the new turbo first, then the new one to compare. I don't believe you will get enough difference to notice.

You are going to have to do something for an oil separator, or you will be loosing considerable oil. It's illegal to run an open draft tube, and you don't want to smell it, either. You must at least run a hose from the valve cover to the intake, probably behind the air filter is best.

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!