the stock intake and the stillen g3 might share the same ID but the stillen has better laminar air flow and 2 quite big air filter which reduce a lot the restriction of pumping the air thru them.
its the same story when someone put some K&N drop in .. they gain in general about half than the stillen because the restriction of the airflow is less in those filter than the OEM ones.
this is why I always recommended to make a custom CAI if paired with bored TB.
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