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You looking for just general suggestions like upgrading the LCA bushings? - helps with handling and somewhat corrects the uneven tire wear issue. Or are you looking for customization ideas, like suspension, wheels, etc?
If yes to the later I'd suggest checking the Build Threads section for mod ideas. Also try the Aftermarket Wheels thread as well.
Sidenote: I believe almost anything listed to fit the AWD IS350 will work for your car as well.