have giac x+ for sale, check my other threads
Yes this would work. APR recommend upgraded DV and downpipe, but they are so conservative in the tuning i don't see any issues.
The software was updated to the latest rev about a month ago. I doubt there will be any updates in a long time[years]. Many people never update after their first tune, no real need to unless it has issues.
If your near by i'll give you a quick ride in my car so you can feel how smooth it builds boost.
PM me if you want more details.