This will keep the oil out of the intake system, out of the intake boots (the oil can make them deteriorate), and out of the turbo. It will also help the intercooler be more efficient at cooling the incoming air. Note that if you have more than a small amount of smoke from the poossibly now exposed CCV line, you have excessive blowby from your piston rings. I'll just apologize for clueing you in now. A great how-to writeup can be found on FTE.