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http://www.ebay.com/itm/Nissan-Skyline-R32-GTR-NISMO-Oil-Separator-Oil-Catch-Can-11830-RSR25-/122376117875

you do NOT want a short line on the breather.
stock there is a oil -air separator .
this restrictive orifice allows air to pass by but oil to flow back.

with such a short line the vacuum will...