The 17" steel wheel spare & tool kit will get you halfway there because they weigh 50lbs.
I'm getting ready to remove the carpet, center console & rear door panels as soon as the Mugen Si Quickshifter gets in my hands. I've already removed everything from the backseats back into the trunk.
I wish someone made a plug for the moonroof that way I could remove those 50-60 lbs from the top of the car. Oh & how bad I want to remove the passenger seat too but the airbag light will go off on the dash.