What engine have you got in it and why are you chasing the 1000kg mark??
ABF, not notionally chasing a ton, but seems a good figure to aim for.
remove all roof and pillar lining etc.
I want to keep the front of the car reasonably comfy and not all rattly/tinny/rough, but this may have to go later down the line, I like some creature comforts
All plastics, arch liner, etc!
Smaller wash bottle, exhaust manifold. Cast manifolds weight a lot.
Without spending a ton of money then stainless manifold is out, Glen Ess says that they are mostly junk and I respect his opinion.
why not have less exhaust? Instead of a long one making its heavy way to the back 
Noise regs sadly, presently I get through any rated test as I'm below 86dBs
And look up supercapacitor car battery on youtube. weighs a lot less than a traditional car battery.
I've been meaning to watch the youtube link as this could be an easy 10Kgs!
Once the interior is ccompletely gutted except for the essentials why not chop out all the extra brackets, lugs and excess steel? Have you removed the rear bench support on the floor pan?
Ongoing, it's not a great deal but it certainly all adds up!
Electric windows and central locking system?
Yup its going when the plexy goes in
why not pick a lighter base vehicle if your going to be competing?
I could have gone for a locost with a bussa engine and been done with it, but I had a valver, it and me have grown together and I like it, I know it
