There you go then, two sides to each opinion.
I saved 24kgs on the battery and then just over 10kgs by going from metal bonnet to carbon fibre, that cost me £1200 before paint. It is a road car and has 469bhp, the car all in is around 1000 kg and I hope to come in under that and the engine will end up around 530 bhp before Mark is finished. I can also save another 12 kg by swapping the boot which I will do.
What made the 205 gti handle so well and go so well was light weight, amongst other things, when my car was converted to 4wd cossie power a lot of weight was added and I don't want to dull that, some extra weight cannot be avoided but to me I want to keep as close to 1000kg as possible. So I added power, lots, but also added lightness in the spirit of the great Colin Chapman, simplify and then add lightness.