If you're thinking of venting straight off the crankcase to atmosphere, think again. You must use the vac line, or you will smoke at idle. Since you'll use the vac line, you'll be creating a massive air leak. Your FI system should cope with this, but then again, it might not. Last thing - the venturi effect of the existing crankcase vent line pull off a lot of fumes. You'll smoke when coming off high boost, too with a mini-filter plugged on top.
Looks nice ... doesn't work.
This setup worked okay on my 8V, but the basic mixture had to be setup to accommodate the larger air intake into the idle mixture. I found I did not smoke on idle or when coming off boost, but the car did lean out at high boost, which is very much bad news.
I put a catch can in to find out where all the oil on my mixture plate was coming from. In the 15,000 miles that catch can was on it caught about a third of a teaspoon of oil. I removed it.