Intercooler upgrade would be useful from the view of keeping the charge dense when you raise the boost level, as doing that is pretty much a guarantee of getting extra power, however youll also have to contend with the inherent design limitations of the k-jet system in respect of how much air it can flow and still give correct fuelling.
Dont want a lean out situation occuring so a standalone management would be advisable.
Headwork, i do that already, pm me if you wish or take a look at this article

hope this is ok with "der management") ?
http://www.audifans.net/modules.php?...=19685&start=0
Exhaust system will likely give a benefit also depending on how restrictive it currently is.
Hope this helps.
