This replacement aluminium header tank fits in the stock location, with the stock bolts, uses all the stock hoses and stock radiator cap, yet adds 2 litres of extra coolant capacity inside the natural fill level of the engine i.e. you don’t have to overfill it to take advantage of the extra capacity. It features a sight glass on the side to check the coolant levels, and is internally baffled to stop the coolant moving about too much during cornering, but also to reinforce the tank so that if you desire, it can use the 1.8bar SpecV radiator cap available from your GTR dealer.