I just saw you recently finished a Stillen Sc install, I too just finished my install. Are you happy with your results of the Stillen SC? I am a little disappointed as I was expecting to feel more brute force power...it seems just a little more "snappy" with ability to spin wheels in first easier. I drove a mustang that was SC'd and it was raw power! He said he was estimating hi musstang around 500 hp as he never had it dyno'd. Driving his car, I was determined to get a SC...now I did, but I dont feel that power like the mustang had.
Anyway, I didnt get it post SC dyno'd yet as i have to get my boost gauge installed and verify boost is in 7.8 to 8.4 range. My Z is a stock (except new SC and oil cooler) 11' Nismo with 17k sunny day car. I bought the stillen canned tune. I noticed you have two power differences than me...you have 9 lb pulley an different cat back. Since nismo does have upgraded exhaust, im guessing my exhaust isnt a big game changer for me.
What is your feeling of the Stilen SC? Did you pay someone to update the tune? Are you east coast? Any thought and info greatly appreciated.

/Z/