I looked into it when I sold my Limited and purchased my SRT.

You will need the spoiler panel, the motor, hinges and mounting hardware, the drain tubes, the wiring harness and the switch on center console, a new fuse and make a custom wiring harness from the fuse to the switch - and the system will not automatically deploy the spoiler - it would be a manual task.

Like others - I thought the SRT spoiler was to big - but now I like it - I like it alot.

** EDIT **

As for installing an SRT spoiler on a Limited - not sure - but I bet you could fool the system into thinking the flapper was always deployed - if you kept the stock wiring harness...