I had an M Roadster before the Boxster and learned the importance of trunk space. The dual trunks was actually a key reason for getting the Boxster. That and the fact I totalled the M Roadster at Sear's Point

.
When I go to the track, the Boxster is fitted with:
- A full-sized tool box with just about all my tools
- A second tool box w/ extra brake pads, lap timer, tire pressure gauge, pyrometer, serpentine belt, sparkplugs, brake fluid, wheel bolts, spacers, wheel chocks, magnetic numbers, etc.
- Portable air compressor/battery
- Windex and towels
- Full-sized jack
- 2 jack stands
- 2 folding chairs
- 22" overnight bag
- Laptop backpack
- 2 helmets, gloves, neck brace
It's pretty amazing how much you can fit in there.