[scooder]

That's contrary to what I have found. On a wide band gauge setup and on a workshop exhaust sniffer, the difference was notable, hence my post.
And again, we're talking a supercharged engine here. The fuel mixture is critical so why throw in a variable that ers on the side of lean?
I'd vent to atmosphere, with a catch can. Simple and absolutely won't screw with the fuel curve or effect the rest of the engine in any negative way.
Sure makes sense to me.
Martin.