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Depending on your engineering and fabrication skills, you may be able to jury-rig the original mechanical parts to operate on command without disturbing your ECM.
Just to give you an example, and maybe use this example as a point of reference - if you were to purchase the part for the carbon fibre door scuff plate (that come with the Performance Package), it would run you $4,500 EACH! Yes, you read that correctly - $4,500 for EACH of the CF door sills, directly quoted from the Lexus Dealer parts department. That's a total of $9,000 for both if you're looking to install those after purchasing your car. The performance pack, if I remember well, was $5,700, which included:
ACTIVE REAR STEERING
SPEED-ACTIVATED REAR WING
VARIABLE GEAR-RATIO STEERING
CARBON FIBER DOOR SCUFF PLATE
EIGHT-WAY POWER FRONT SPORT SEATS WITH ALCANTARA®* INSERTS
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.