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For anyone that cares. The STOCK AIR BOX(not intake) is VERY good.
COMPARED to my TRD USA it has slightly less torque(few Nm) around that dip and about 1-2hp less hp at higher revs.
How do I know? I had to switch back to stock airbox after HKS Type-S oil filter install(TRD USA air box won't work with it).
I'd say.. stick with the stock airbox, change out to a NON-OILED panel filter(like AVO) or the pink TRD JP replacement($100 or so - CONSUMABLE, non-reusable).
Most of the F/I kits for these cars still utilize the stock airbox so it's a no brainer.
As for the comparison between stock accordion snorkel vs the Perrin Silicon intake tube.. didn't get any dyno reading on that bit. Maybe some other kind soul will spend their money and do some R&D for us..
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