I have an05 silverado 1500, Z-71. 6 Inch Skyjacker Suspension lift, 3 inch body lift, 37x13.5x17 Nitto Mud Grapplers. Moto Metal 951 Black wheels. Flowmaster True dual 10 series. ARB off road bumper, HID head and fog lights. 20% tint. K&N intake, hypertech max energy programmer, jet performance chip. 2500HD towing mirrors. I want more power but not looking to drop 5 grand on a supercharger. Any suggestions????