The things I currently have on my 2003 Celica GT

Red painted calipers
TRD Plate
18'' Helo Tease 825 Rims
Custom Truck Audio: Dual 10'' Powerplants with Fusion AMP with Red Custom fit Box
Alpine Deck
TRD Exhaust with TRD Action package

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With this in mind, what would be the next step in customization?