Given that BMW won't make an M3 Touring (but seems happy to build a worse riding and less practical SUV version, and thinks that wagon buyers will cross shop to an SUV), I think my next (and likely last non-electric) car will be one of these - in Alpina blue.
https://www.topgear.com/car-news/frankfurt-motor-show/alpinas-455bhp-b3-touring-m3-wagon-bmw-wont-make
I'm pretty stoked, but there are still a few things to worry about. The differential makes a whiny sound when coasting.
I think it wasn't put back together properly, and the input shaft bearing/crush sleeve isn't right.
I'm very excited to get all the kinks worked out, and get it back on the road. I wouldn't mind going to the E30 Mega meet this year.
Left front door, steel (41518230467) = 16.980 kg
Left front door, aluminium (41518188861) = 9.400 kg
So it's 7.5 kg per door, that's meaningful weight, especially so far out from the longitudinal centre of gravity.