dremen,
I ran a 13.4 and a bunch of 13.5's with:
Std ecu, std intercooler, std turbo 10psi.
Full exhaust, light flywheel and standard airbox with a replacement K&N element.
I ran a 13.8 without the light flywheel.
then again your mate is a guru so I must have dreamt it all (even the time slips I have posted).