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I agree that with a N/A car a breather is fine. A catch can is usually seen on a turbo car. Problem is when you boost around 20 or 30 lbs of boost you get pressure in the block sometimes. The catch can will catch any oil that comes out the breather for the engine. The catch can goes between the breather and the engine. So, as was said, with a N/A car you do not really need a catch can.
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