i also ran the 1/4 mile with a stock box in my previous gtr which made 320awkw & managed a 11.1 sec with 129.75mph.
that was my last run, however, i crossed the line in 3rd gear & was bouncing on the limiter & my 60 footer wasn't that good (1.6sec?)
considering the relatively low power level i had at the time (hks gtss @ 23psi) that car was capable of a 10sec pass, but unfortunately i fudged it over the line
breaking boxes i think comes down to the driver & treating the box with respect, i.e. no flat changing