I just hit 13psi with my d1 with a 3.9 pulley. Car is insane at any rpm. Doesn't hit like a Maggie at first. But will come on boost rather quickly and give u quite a linear power curve.
While the Maggie is spinnin u r winnin
2008 G8 GT
TSP Forged LS3-TSP Ported L92's-219/231 RCR Cam-Procharger-Kooks-Solo 3in Exhaust-SS Wheels-Brembo-Demon8 Designs Triple Gauge Pod-Kicker CVX10-BMR-BC Racing Coilovers-Squash Pump-Coolingmist Meth Injection
613/546 @11.5 lbs old worn out numbers
11.6 at 123. 1.92 60ft