This is a simple modification to your airbox. Drill a 3.5" dia hole and 3 additional 1/4" dia holes for the fasteners. I replaced the fasteners with ss and added flat washers.
Adds almost 10 sq in of opening to the 26 sq in that are already in the box. Also allows cold air to enter the turbo.
Go to
www.psmbuick.com for details, hp & torque curves and temp reductions compared to AFE Stage 1.