Water injection is a cheap way to safely raise boost. Joseph Obernberger sells water injection kits on his website
http://water.lovehorsepower.com/
$360 for a stage I (single port injection)$410 for a stage II (dual port injection)
Or you can source parts and make your own kit for a little less.
But if you're looking for a shortcut to higher boost, and you haven't already read Dee's sticky
zerothread/230677 then you definitely should. That's wisdom right there.
Dunno about the wastegate...doesn't seem unlikely.
iirc stands for If I Recall Correctly.
Hope I was helpful.