Remember to watch out for digifant lag, this is commonly confused by bad grounds when it is a factory programmed delay of time to enrichment which is fine at low boost levels but is VERY dangerous at high boost levels or with devices such as lysholm or turbo which have VERY rapid onset of boost.
You can detect this with wideband or narrow band when you mash the gas (actual digilogger data direct from ecu link):
or watch this video. If you have the LAG, you will see a lean period while the boost kicks it:
Do not confuse this issue. It was purposefully done by VW programmers on the ecu.