Chevarado Guy

Which porcharger unit did you install...have you had it on a dyno....is it the 5.3 or 6.2? We installed a Procharger D1SC on my '15 6.2 Silverado. I have Kooks headers, 3.5" Borla exhaust and an electric cutout. We are having issues getting it tuned in...and when we open the cutout on the exhaust...the horsepower drops almost 40 hp. It keeps setting off the mass air flow and map codes...and once we hit 80mph with the throttle wide open it starts to take away the timing and then cuts the throttle? When we hit 4th gear the truck seems to think it is producing 800 lbs of torque and things go downhill from there as well. On the dyno it is only putting down 480 hp and the tech has never seen a 6.2 produce under 500hp with the procharger on it. We started with a 4" pulley and it was producing 12lbs of boost...jumped to a 4.25' pulley and had the same issues with less boost/power? Does anyone have any ideas?