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I have been very pleased with the Verus Engineering AOS, in a drain back configuration so there is no need to drain it. It acts as a dual aos setup, and can be heated as well. A bit pricier, but very well designed. As indicated above, unless you track your car, I would not expect it to be needed for stock NA setup but definitely recommend for FI and a must for built engine. For high HP setup, (say above 250whp) I would recommend an adjustable pcv (wagner) valve with a positive (not passive) ventilation setup as well, to ensure the block is well ventilated and does not build pressure in the crankcase.
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