With an intercooler swap, it's no big deal since it doesn't require a tune. However, if you're going with the X intercooler, you'll need the UICP as well, or just buy a full metal piece from an aftermarket vendor.
When doing the swap, the LICP is the hardest part. Attack it from every angle possible. Also, you'll notice that the zig zag plastic BPV pipe won't fit with the battery and intake snorkel in place, so check this thread from EvoM for suggestions:
http://forums.evolutionm.net/09-rall...tercooler.html