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Originally Posted by Maila87
Is catch can really so important for our cars which don't have direct fuel injection?
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It's just another one of those minor optimizations. I doubt it's "really important" for anyone unless you're running FI and/or a very aggressive tune that's more octane/knock-sensitive than stock.
The vapors condense to some nasty greasy stuff for us, but at the rate of 1 tbsp per 500 mi mixed into your intake air, it's not a *huge* amount. It will contribute to carbon/sludge buildup over the very long term though, and it will effectively very slightly reduce your fuel octane rating.