We're here... as always. The kit is under development. We'll have more details when we're closer to release, including pricing estimates.
We're not about creating hype before a product is develop and tested.
EDIT (For those not making it to the last page):
STILLEN Blog is being constantly updated - Here's the current posts
http://blog.stillen.com/2010/01/370z...m-progress-rd/
http://blog.stillen.com/2010/01/370z...d-intercooler/
http://blog.stillen.com/2010/01/370z...fold-detailed/
.