I popped the trunk to put a birthday cake in it and to my surprise it didn't fit, why the huge hump?

I believe that would be the FUEL TANK that protrudes into the "trunk area".
Heck, it is a roadster after all; this ain't an Astro Van; if you have that much stuff to haul around, you shouldn't own a car like this until you simplify your life. :bandit:

Have not put anything in the trunk, yet.
Not a big thing for me.
Maybe you need a smaller birthday cake.
You know.......calories!

well that is a good point.
i mean, if you have a passenger, you will have room for NOTHING ELSE!
Cummon!
I can't even pick somone up from the airport in this thing!

Just depends on who and what you are picking up at the airport.
Tell the person not to worry about luggage because ou can buy what you need elsewhere.
It is a roadster.

Its called the mayan temple over at the other forum

I popped the trunk to put a birthday cake in it and to my surprise it didn't fit, why the huge hump?That's the fuel cell. Since it's a rear wheel drive, it's gotta go somewhere !:o
HTH
WopOnTour