well the supercharger itself weighs 5kg, then all the brackets, oil cooler, lines and everything else weigh 10kg

A turbo weighs about 5kg so they cancel out, then the turbo manifold and downpipe compared to the 4-2-1 I would imagine would be 2kg heavier tops.

So its a 3kg weight saving when I think about it

Ill save 1.5kg by running a lighter crank pulley, which means im 4.5kg lighter than before, ill know for sure how light we are when all the remaining parts are in and we put it on a proper cornerweight scales.

Thanks, hopefully have an update later on this week with a bit of progress