I just installed a Stillen kit on my 2009 sport/touring Z (auto trans), and became an instant Stillen disciple. The amazing increase in torque and horsepower absolutely transform the car. This is a great kit, and worth every penny. Installation is easy enough that I can't understand why anyone who knows one end of a wrench from the other would pay to have it installed. The kit is complete to the point you probably won't have to leave your garage to complete the installation--as long as you have a fiber-optic scope to use while installing the right-side manifold bolts. Stillen somehow "overlooks" this requirement. With my supplemental instructions filling the gaps not covered in Stillen's, any average DIY mechanic can install the kit in less than 20 hours. I prepared the attached instructions to help others around potential trouble spots.
The attached instructions must be read in conjunction with those Stillen supplies with the SC kit, available at:
http://www.stillen.com/media_files/407770.pdf
I've attached my instructions in .pdf format, readable by anyone with Adobe Acrobat. This is a link to the pictures in my album on this forum that go with the instructions:
Nissan 370Z Forum - wortmeister's Album: Stillen Supercharger Installation pics
If you're serious about an installation and wish further info, ask for it, and I'll respond via this forum's private e-mail. If you live in the Phoenix area, I might provide direct help with the installation.