If you are looking to add a little more boost with very little work, upgrade to the Wicked Wheel 2. I just got one from R&D (to accommodate my 90cc IP and R&D injectors) and that WW2 is amazing. But I have studs, so maybe you don't want to push more boost into your intake without studs.
The most noticeable change to my boost with the WW2 is the low-end boost. The van is a lot more snappy. So maybe you won't get a lot of additional high-end boost (as many people report better low-end boost but similar high-end boost as before), but I did get substantial more boost on both the low and high end.
The install was really easy. Open the turbo, ratchet off the turbine, put the WW2 on. You might need to undo the down-pipe (I did) to hold the exhaust side from spinning, but I just unscrewed it a little bit and separated it only an inch to get my hand in there. Then put the turbo back together. It only took me an hour to replace and that included me tearing off the doghouse and air-filter housing out of the van engine bay.