Since I am updating non BMW cars: A few more items that I changed recently.
OEM DV was replaced by a GFB DV+ (this was not really 'required' but it was an easy job while the Turbo hose was being done and it replaces the plastic stock unit next to it). Apart from the obvious material differences, it also becomes problematic over time with higher boost.
Samco intercooler hoses
Samco Turbo Inlet pipe
The reason to do these is to avoid deforming under higher and sustained boost as you'd find with track use. It also prevents cracking of the hard and fairly thin-walled plastic inlet pipe.

I also did a complete brake fluid and clutch flush/adjustment. Good ol' Motul RBF660
Turbo outlet resonator delete (this is a point of failure of sorts: the stock resonator disintegrates over time and the material makes its way towards the intercooler core. Not an issue on my 16000km example LOL but still worth doing 'while in there' there is a few mm of carbon fibre between you and the turbo (where this kinda sits) which is why I guess Alfa decided it should be resonated? Anyway it's a simple-enough inexpensive replacement (again while the labour is being put in).
All this is in preparation for an intercooler upgrade at some future stage.
Car is still going well and I did a track day a few weeks back as well.
I can feel the Michelin PSC 2s are now coming to the end of their useful life (especially together with more power where I had some squirelly moments LOL). I am considering a wheel upgrade which will allow me to run 265s at the rear (Below). Something that is more OEM+ than others that look quite out of place (OZ, Novitec, Titans). This may coincide with my next set of tyres (and perhaps a change to different tyre too) I'd spoken to Firi about a custom set before. It's a strange PCD (5x98) so there are virtually no 'off the shelf' inexpensive options. That said, pricing doesn't seem to be terrible for 18F/19R sets.
Trackdays are also where you really realise the power to weight (and lightness) which you forget driving this and a 600hp car on the road every day. The new M5 is 295hp/ton. My F90 is in theory 332hp/ton. A G87 M2 is 270hp/ton (all in theory actually cos we know BMWs dyno that at WHP or higher). The Alfa is 340hp/ton (dyno number) in current form and just doesn't have any weight to it, so even with the numbers above being similar, it feels TOTALLY different. This is also why sometimes it seems that I am exaggerating when I say the upgrade is not gonna be easy or cheap on this one. 430s are about the same and a 458 is only SLIGHTLY higher hp/ton (and at JHB altitude this equation goes the other way for both of them). The 488 is just too expensive but its the "jump"
Either way since logic and physics are not aligning with my bank account, I think the Alfa will permanently be my track toy and I whatever gets added will be more for open-top noisy fun...
There are two handling mods I have left to do: GMS Uniballs on the control arms (they are likely coming due with age and being rubber...) and the Alfaworks race shims.
Also a fairly hilarious size difference vs. Cayenne
