The aluminum tank is the cooling system fill tank that has the raditor cap. The fill tank is plumbed into the low pressure side of the cooling system as is proper. The stock black tank is the overflow. BTW the red fittings go to an Accusump.
The details with many pics for those curious regarding the modified cooling system are here: http://www.spacecitypanteras.c...Cooling-JTaphorn.pdf
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