I had my series 2 chipped and set-up @ PTS in luton, the power run after the set-up came back with 209bhp @ 4800rpm

The mods are as follows:

PTS 185 chip
Stage one turbo (boggo intercooler)
Pipercross induction kit
Magnex exhaust
Boost set @ 15psi

At the time i thought nothing of it, other than good power, since then i've had a ribbing off my mates saying that's impossible with these mods, and espec with such low boost.

Any thoughts? Or could that be correct?