Stock I ran a 14.3.
You'll need:
Intake
2.5" exhaust
TD05 @ 16psi
Evo AFM, ECU and Injectors.
An intercooler upgrade of some sort.
it has been done on the TD04 before, but I wouldn't recommend it. Best I got on the TD04 was 13.49, but that was still on the stock exhaust.
Do you mean the TDO4L? and 13.49 with stock exhaust in a 1190kg gsr? That is very impressive.
Best I got out of the tdo4l was 13.75 with;
K&N Airfilter, Split dump, 3" Exhaust, upgraded intercooler, cushioned ceramic clutch, tuned and bugger all fuel in the tank and driver 80kg..