his stage 3 is the same level of tune as a REVO stage 2+ map. it depends on what tuner it is as to what they call it. for instance REVO stage 3 on the k03 TFSI requires new injectors, turbo etc etc.
yet shark performance and DNA etc call the HPFP tweaked map a stage 3. and for the turbo upgrades they call it stage 4.
iirc he has a decat downpipe, BSH intake (think he might have removed it) and autotech HPFP internals.
normal figures allowing for dyno lottery etc are stage 1 240hp-, stage 2 260Hp, stage 2+(stage 3) 270-280hp. Obvioulsy some dynos will easily read huge amounts more but make of that what you want.
have a read through this post.
http://www.mk5golfgti.co.uk/forum/index.php/topic,16977.0.html