Hi,

I would get a second opinion from a reputable tuner,
i have several books on turbo charging, and converting a N/A engine
it list It is vital that the oil drainback system from the turbo to the oil pan
be completely free of kinks, sharp bends or other restrictions so that oil back pressure in the line can't spoil the flow of fresh oil coming into the unit. OBVIOUSLY THE POINT AT WHICH YOU DUMP THIS DRAIN LINE INTO THE OIL PAN SHOUL BE ABOVE THE PAN STATIC OIL LEVEL OR THERE WILL BE BACK PRSSURE.
also to the above the return pipe diameter must be considerably larger
than the supply inlet pipe,because of aeration and foaming that takes place as the oil passes through the high-speed bearings.

Regards Dave R.