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Looks and sounds good but no performance enhancement, at least not without modified exhaust and EMU.
Robin, That's the point I was trying to make, the factory air filter is pretty efficient and there isn't likely to be any HP improvement just from changing it to an aftermarket one.
My reference to the Cup air filter not working was assuming GT3SM wanted the actual air filter mounting assembly from the GT3 Cup car which I understand won't work on the street GT3 as it lacks the MAF sensor mounting.