So, I purchased the X4 w/ tunes from Unleashed. I kid you not, chose ground shipping and it showed up the next day! Very impressed.
I didn't want to install a tune right before Christmas holiday, just in case, so I finally got my info to Torrie yesterday and he turned around a tune, crazy fast. I installed it.
BTW, its very unnerving, because it says "turn the key"; "don't turn the key", "leave the car on"; and then everything goes black and I'm "crap, I so f'ed!"
Luckily, it all worked! Did some high speed runs today, and I'm VERY impressed! A lot more pull, firmer shift and it felt like it would pull forever! Never faded and was responsive as hell! Problem now is my bottom end is "RIGHT THERE" as soon as I touch the gas! The only other upgrade is a K&N filter in the stock air box at this point.
I wanted to send a special thanks to Torrie at Unleashed and to this forum for showing me the way!