Sorry, don't understand what that means..... If you mean have I put my foot to the floor in it yet, then yes, I've done a few WOT spirited runs in it with out over heating.
As far as being a small inner dia., yes, I guess it looks smaller than stock. I have had zero issues with water temps, and I'm talking massive under hood temps with the twin long tube stainless headers.
I have a new stock oem R33 GT-R water pump and thermostat with a dual pass alum radiator, and a 16" puller fan controlled with a 185 deg on thermo switch.
I've never gone above 208 deg, and thats in 98 deg weather, at idle. ( 50/50 Antifreeze/water)
I think -16 is sufficient for my application. It should work for you too, huh?