Funnier still.
I ran a 13.1 over two years ago now, at Calder. I have the time slips if you want them. They should even be on the fullboost site.
This was before the engine rebuilt with stronger internals and other goodies to suit. Not bad for something you said that is unreliable, over heats, rusts and shit. I wonder how long your skyline will last with the several interstate trips I've done with my i-R between Melbourne, Canberra and Sydney.
I haven't ran it since then but I happily spank a 12.7 R32 GTR with me running less boost (1 bar) than I have it tuned for (1.4 bar) ... this was because the GTR was running 1 bar.
Here's the fullboost link. Mine is the grey GTi-R
http://www.fullboost.com.au/racing/dragmee...alder_0101.html
And yes, it's my daily drive, my interstate drive, my daily hoon, my daily 7500grand rev and my daily 1.4bar (~20psi) shopping machine.
Yet to overheat, rust, and install a big ass stereo in the hatch. Hell, I even have the crappy 14" steel wheels on it.