i/c'* plumbed with cold water, and TWO widebands in it at the same time.
Smart move going to Two widebands. I love my wideband meter but it doesn't tell the whole story. :(
You don't mean that you weren't running your intercooler when you blew #4 do you.
I know it was cold outside but you are still going to heat your air charge as high as 190*F(or even higher, I'm basing the temp readings on my own set-up at 13 psi) .......instead of 250*F if the outside temp were 60*F warmer.
Your intercooler should drop your temp by 100*F or so.