[JKo]

I honestly wouldn't consider the arm difference as 15kg, having not weighted them but picked quite a few up, a few kg perhaps, still worth fitting regardless

I weighed them when I did the conversion, total difference to R53 arms is 6kg.

There's a thread here somewhere with quite a few weights listed, I added a lot of parts there when doing the rear seat delete.

 

[JKo]

Even though this is an old thread and Alan no longer needs help with this, there's still good info here and ppl will have opinions.

 

[JKo]

across the pair?

Yup. 3kg difference per arm.

 

[JKo]

OEM type battery is about 15kg, and the lightest you can get these days is around 1kg I think. Won't be cheap tho. Braille B2015 was about 7kg IIRC, and it was only like four times the price of a normal one...

I have seen hollow anti-rollbars too, those are sligthly lighter. Speakers and headunit already gone? Delete A/C and power steering. Halogen headlights are lighter than HID's. There were lightweight door cards available from Lohen at some point, might still be. Carbon steering wheel is always an option, if you don't care about losing the airbag.

With a lighter flywheel you can lose 6-8kg easily.

 

[JKo]

If the car has a sunroof, a carbon replacement panel will take about 20kg off of it I think.