Hi Neil,
The ED30 did have the rear seats out and no spare steel wheel (had 4 in the car!!). I reckon by going for it I can strip the car below 1100kg.
The M3 is a lovely car.....just not faster than an ED30
All day I was overtaking M3's and only once let a seriously modified CSL pass just to follow his race lines (even then he didn't get away!)
If you seriously want sound and speed, get a MKV R32 DSG and either supercharge or turbo it (£30k will get you the car and 500bhp!!)