I would like to know what boost he is running.

ImportLabSRT is holding 14lbs and shows about 428whp on a DynoDynamics (I think he also dyno'd on a DynoJet and saw 506whp, though I do not remember 100%)

...that was with a GT35R.

...definitely an interesting setup, and some similarities between it and the Turbocharged SRT6.

...very nice custom setup though.