theres a lot of people in the mopar hobby that dont like the idea of using Mustang II style spindles, which most other coil over kits use, HDK,GTS,RMS etc. Because of the angles and how the mopar spindles are, it's extremely difficult to get the correct geometry to go rack and pinion and use the rear steer mopar spindles. I'm sure Denny or Carl will chime in as to that as well. and if I recall right, the QA1 kit retains the factory Torsion bars which a lot of people like that as well.