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Since we're talking about road cars here, it would be illegal (and unenvironmental) to vent those hydrocarbons to the atmosphere. The catch can can drain to the sump, but the gasses must be circulated into the intake to be burned. I favor the existing PCV valve and hose arrangement.
There are electric vacuum pumps, too, which would draw less power, be easier to mount, and run only when necessary. Jegs has one for $250, but eBay has them for $60+ used, out of diesel applications.
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