Standrad 172 / 182's seem to average 15 seconds. You'll get some freaks hit mid 14's and some mid 15'ers.
Best iv done up to date was a 14.4 @ 99 iirc but never ran it after the 2nd mapping sesh, change of wheels and heavy ice in the bin which im confident would have hit a low 14, mods being pretty much the usual N/A single TB bolt on's and cams