Magnum Force Stage 2 Si Black Intake System (51-81012-B) by aFe. Filter Series: Pro Dry S. HP Gain: +12 hp. TQ Gain: +15 lbs. x ft. Includes: Air Filter, 2-Piece Sealed Housing, ABS Cover, Auxiliary Air Inlet Ducts, Roto-Molded Tube. The aFe Stage 2 Si Cold Air Intake System replaces your entire factory air intake system with a large high-flow aFe air filter, a totally enclosed airbox and a smoothly contoured, less restrictive intake tube. This system enables your engine to take in huge quantities of dense, cool, oxygen laden air. The result is better combustion, increased horsepower and torque, and a noticeable gain in performance.