Stock trucks are seeing about 280-290hp at the wheels. The Vararam isn't going to show much of a gain on the dyno because of its design. It is built to force air into the engine while you are driving...the faster you drive, the more air is being forced into the motor. With you sitting still on a dyno, air is not going to be forced into the engine thus not showing the true potential of what the intake is doing for you.