Good point on the too much cooling. Had not thought of that. Not sure this is going to be a problem though as STA radiator was typo in catalogue and only 522 x 270 x 60 not 522 x 350. Volume 0.011m3, area 0.141m2 which seems too small.
Plan D was Fenix radiator, but that one not in stock.
Inventing plan E now. Maybe BWM M3 will fit at core 550 x 440 x 42. Got to check overall sizes.
Or end up at plan F and get it custom made.
Track day approaching now…
Not sure what a radiator shop can do with the existing one or if it is worth taking it in?