Does anyone know the volume of the factory, boot mounted, intercooler water spray tank,for a 07 WRX?

I cannot get it confirmed thru Subaru (yet!) or by reading my car manual.

I have a feeling that is is around 4 litres, but not sure.

I have made my intercooler spray automated and run thru a shit load of water and before upgrading the tank I want to know what I am upgrading from.

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