DIRTY AIR Basic Front and Rear Air Suspension System

For HD Touring models.  Complete rear system, and complete front system.  Includes 2 compressors with year specific mounting brackets, rear shocks, front air pistons and springs for applicable models, 2 dump manifolds, and all tubing/fittings/wiring etc to complete installation.  1 compressor operates the front, and one operates the rear.  Lifts most touring model bikes in approximately 13 seconds.   Other option runs the complete system off of one compressor, and includes the proper valving to distribute flow up/down front/rear.  Front and rear operate separately, front takes approximately 13 seconds and rear takes approximately 13 seconds.  Please not this valving is not sufficient for incorporating an air tank!  Made to run as-is, not to add a tank! Steel shocks measure 9.5" collapsed, 13.25" extended (measured bolt-center to bolt-center) Aluminum shocks measure 9.5" collapsed, 13.75" extended (measured bolt-center to bolt-center) What's the difference between the steel and alumin