Well here's what their website says:
" The Ultimate in ride quality. The Inertia Active System (I.A.S.) 440 Series Twin Shocks are the most state-of-the-art shocks available to the public."
"The 440 Series I.A.S. shock is able to separate chassis movement from wheel movement. What you get is a shock that is able to float over the rough stuff, yet won’t wallow in the twists and turns. They are absolutely the best shock available when it comes to today’s high torque shaft-drive motorcycles. No other shock can control the torque inputs of a shaft drive and still maintain a smooth and plush ride."
"I.A.S.® technology utilizes two separate rebound damping circuits to control chassis and wheel movement independently for the ultimate in stability and comfort. I.A.S. was developed for automotive use by Edelbrock using Ricor technology, but has been refined by Progressive Suspension for motorcycle use."
Other than that, I dunno. Maybe it's magic and voodoo, all held together by Pat's RTV.
edit: Found a little more explanation at
Edelbrock's site.
