Is the TII's radiator bigger then the NA ones? Thanks

They're the same.

My N/A has a radiator cap, Unique TII's doesn't. https://www.nopistons.com/forums/pub...#>/biggrin.png

Mazda came up with different upgrades to the radiator over the years. The lowest form was the radiator cap on the goose neck with the over flow tube.



The later update to the system was having the radiator over flow tube with radiator cap at the radiator top and having the goose neck part use a springless cap with a different plastic flange (no overflow tube at this end anymore).



THis changes were form the 86-88 versions, later version (s5) had other different updates.



UniqueTIIs has the first version of the system.



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