2005 blob sti

Looking to get new caps for rad and header, I've looked on "import car parts"
And they list the header cap at a rating of 1.1 bar or 1.3 bar
And the rad cap at a rating of 1.37 bar

But the one on my header at the minute is 0.9 and 1.3 on rad

They do say genuine subaru parts for newage cars... I'm confused.

Still running the original pipe work in engine if that makes any difference, but silicone upgrades will be coming sometime.