post MAF cleans up the bay because it gets rid of the rubber dampeners / corrugated look that also helps with installation variation. smoother airflow will net you a little more performance as well, but not much.
i'd consider K&N or aFe drop in filters + post MAF and you're good to go.
exhaust...look in the exhaust forum, to each their own IMO
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凛 ('Rin') - 2009 Nissan 370Z
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