New part in the works.

Originally Posted by AzSpeng

those are the caps for the coolant overflow bottle.

Originally Posted by AzSpeng

ill anodize almost all of them black and keep maybe 30-40 of them in raw aluminum. Could do colors but once we get the groupbuy rolling ill have everyone do a poll on which colors. it costs me $ per color per batch so its not cost effective to run a single of 1 color.

Originally Posted by mab864

Here's the set-up on pressure tank on my '13. The first cap on the radiator is just a sealing cap with no pressure relief spring. I presume the coolant in the radiator heats up and expansion moves it under pressure into the pressurized tank where it cools and then returns to the system. Here's a pic of the cap off the radiator.



And a close-up of the cap showing it's just a sealing cap with no relief spring.



The third pic shows the cap that is on the coolant tank which is a normal radiator cap. I think the idea of the system must be to increase the circulating capacity of the cooling system by 2-3 quarts. It's obviously not just an overflow system. I think this is the same type system on GT-R and the technology may have trickled down from that system.