I've got the complete BMR package and 1 pc driveshaft, tossed the spare (doesn't fit over the Baers anyway), moved the battery to the trunk and pulled about 5 pounds of wire out of the engine compartment, but that was mostly to get the front end weight back to where it was before adding the blower.
If I wanted to toss some serious weight, I'd spring for some serious wheels. I weighed my original Saleen 7 spokes with 275-35/40 P-Zero's at ~50% tread. Try ~60 and 70 pounds apiece for the fronts / rears. That's roughly 260 pounds of rotating mass. I don't go to the track and only occasionally do some autocross, so it's not a big deal for me.
There is a thread on S197forum.com specifically dealing with how much everything weighs. One of the guys started it and individually weighed every part he was taking off the car and other people have added to it. Check that out here:
How Much Does It Weigh? - WWW.S197FORUM.COM
As a for instance, it lists a complete door with everything but speakers and wiring harness as 81 pounds.