[Kingtal0n]

Or avoid a catch can all together. A catch can is only for when the engine explodes magnificently. Otherwise, its just "extra plumbing" that will lower the overall pressure drop experienced by your crank case.

If your engine produces so much vapour oily mess that you actually require a catch can just to run the car, then either you rebuilt the engine wrong (typical, actually) or it's very high mileage and nearing the end of it's service life, or the rings are toasted from poor tuning. Or there is an issue with a check valve.

edit: spelling