Here are a few for you Carbon Fiber junkies.
How about a subwoofer enclosure and new rear seat delete panel made from carbon 1/2 inch fiber/honeycomb sheet goods. Stonger than plywood, lighter than .040 aluminum. Don't ask me if I can get more of this stuff, our aircraft overhauls have been farmed out. But you can get it through Boeing for about $10,000 per 4'x12' sheet.
Bilstiens and new front sway bar are in too.