Unique Performance Rear Suspension System

[Damn True]

$5k for the kit seems awfully pricey. Here is the copy from their site.
Anyone seen one of these things? Seems to me that if the linkage rate isn't linear you'd have no end of trouble getting the shocks to work right.

This Rear Coilover system is the most technologically advanced rear suspensions available for 1964 1/2 - 70 Ford Mustangs and First Generation Camaros, '67 - '69. Elements from various racing series have been put in this package which fits neatly into your existing chassis with only minor modifications. The entire rearend system can be removed from the vehicle easily.

The positioning of the shocks is the most fundamental feature of the system. Removing the shocks from the axle housing greatly reduces the amount of unsprung weight and allows the shocks to work more efficiently. Placing the shocks below the axle lowers the center of gravity to improve handling.

System components include:

* Powdercoated Ford 9" axle housing (minus differential and axles)
* Double adjustable QA1 shocks with 200lb springs
* Powdercoated tubular torque arm
* Powdercoated tubular subframe connectors
* X-frame connector which acts as a mounting location for the torque arm
* A tubular designed mounting cage with powdercoated finish
* All necessary mounting hardware and components