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Hi
An oem Exhaust manifold is made from cast iron but an aftermarket one is certainly not made from aluminium its normally Stainless, steam pipe or inconel.
An oem intake manifold is made from cast aluminium and after market ones are cast or machined aluminium .
 

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Hi, what is the best Manifold for RB25DET S2?

Thank you
Unless you change anything else, the ones it came with.
Easy answer really, also saves the bother of working out which manifold you're referring to😁
 

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Unless you aiming for high power the STD item, the internal airflow distribution design is far more important.
 
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