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I saw this pic and thought it looked cool. I've done some searching and haven't been able to find any rear underpanels other than the Mugen SS rear bumper/exhaust combo, but that's way too much money.
AJ Racing used to sell that part. I just looked through their site and didnt see it but if you are really interested you may want to take a closer look or give them a call.
I seem to remember some people having issues with ground clearance for that diffuser. It seems that those rear fins actually come close enough to the ground that pulling in and out of driveways is difficult.