I have them set for about 65lbs boost (could go much higher -- I have the fuel to match)
Have yet to hit the dyno. But soon.
I have the race twins: super B over the s400.
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2004 Cummins(235HP Model); BD RACE TWINS; 90 HP Nozzles; Twin CP3 PUMPS; TST Powermax; Smarty; Water/Meth; 4" Dual Exhaust; ATS Trans; Billet Input; Billet Flex Plate; Glacier Pump; 18" x 9" Helo Maxx Wheels; Terra Grapplers