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I installed these the other day in my 06 350 Sport package. Plug and play, clipped right into the factory harness. No hacking wires. Great little upgrade!
if you have 07+ the illuminated scuff plates are plug and play. mines took me roughly 10 minutes to install.
In my '06 IS350 they were also plug/play. Harness was tucked away under he non lit ones.
Mine has the Sport Package. The sports package has silver painted trim, sports pedals and memory seats (driver and passenger). Also it sits1/2 inch lower from the factory. Sports package combines some lux/prem package features I think.
When I researching the sill plates for mine I found out that the Sports pkg was already prewired.
Easiest way to tell: Do you have the silver trim/pedals inside?