If you allready have the March kit, just disconnect the ram tube assy, and use the box and the conical air filter. You can make the filterbox opening a little bigger at the inner fender side. I used that for 3 years, and I tested it out at the strip/test and tune day, as well. Box and filter only, 12.83 sec. Ram assy added, 12.83/84 ! Just Me.