Its got a stainless tank on it, the top of which gets coolant residue on it where its seeped out of the cap after its been getting a raping. Cant smell coolant when driving because of the potent petrol smell due to having to hammer ans screwdriver the fuel cap off a few month back when it seized on.

Will check for leaks tomorrow. Still thinkin its gasket starting to just seep combustion gases into the coolant under full boost.

Praying its just gasket failure!

I did notice tonight while driving it, if you sit at a constant 80 ish (on a private road of course ) the temp sits just under the R but if you wind it up and give it some shit it drops down to the bottom of the M. Its only running standard cooler and radiator too.