Momentum HD Stage 2 Intake System (51-72005) by aFe. Filter Series: Pro Dry S. HP Gain: +7 hp. TQ Gain: +18 lbs. x ft. Includes: Air Filter, CAD Roto-Molded Tube, 1-Piece Sealed Housing with Sight Windowith Hardware. Bringing you the next generation of intakes, the Momentum HD sealed air intake system is superior in every way: From the one-piece sealed housing with a built-in sight window, to the massive 1,000 cfm air filter and premium hardware.