Hi im new here.
I was wondering if anyone has installed this package?

Im thinking about getting it and just wanted to hear about actuall results...

It's not available yet, but Irvine Subaru had an advance example they were giving demo rides in. If you call them they can give you the scoop.

for the STi?

or WRX?

WRX. Modding the STi won't be so simple (or cheap).