When Mark isn't stalking this forum he can be found by clicking the Torque Developments Link at the top of the page. Stage 1 boost upgrade with the fuelling and the intercooler will hopefully be done in the next 10 weeks or so, as for how fast it is, don't know and I'm not dyno'ing it or doing any 0-60 until I have finished modding the car, ideally yes you will need to upgrade the ecu if you change the pulley as you need to alter the fueling as well.
Cheers
Si