The Stillen SC'er kit can never put you anywhere near 400 whp. That 400hp claim is probably barely possible at the crank using the Stage 4 kit using a very generous dyno.
Isn't stock at 270? You are saying a stage 3 intercooled S/C will buy me 30hp?
279 (to be exact) is the at the Crank as mentioned by Psiclne. By the time it gets to the wheels, it's much much less. Depending on the dyno, with a bunch of mods you can get thes numbers to the 230/240 whp range.
I my SC is not even a week old and I'm getting 330 at best. I have other mods including 6 larger injectors, and a Stage 4 pulley. Also, I had my FX Dyno Tuned which Raised my RPM Limit to 7500RPM.
TT is lot more power. Plus a lot Quieter.