So, I was planning on doing this for quite some time, I got this machine in 2019 as an emergency because the 2014 macbook air I was using at the time died and I needed a laptop because I was going abroad. It's the 3,1ghz i7 16GB 512GB one (it costed me 1000€ second hand in 2019, pretty expensive).
I did a time machine backup to a external drive, replaced battery (was at 69% health), replaced the thermal paste (this made some difference, fans now don't activate so often and I've got lower temperatures between 3 and 5 °C less) and replaced the stock ssd with a 2TB NVME WD Blue SN580 with long Syntech adapter. Then did a clean install with oclp.
I was already using sonoma on my hackintosh and wanted to try it on my macbook.
It seems to be working fine, I deactivated CPU friend as another user suggested and now fan doesn't make noise after turning on (fan got at ~2500 rpm for 1 or 2 minutes after booting). I was worried about the nvme drive draining the battery as back in 2019 I tried a Samsung evo with the sintech adapter on the 2014 macbook air with terrible results, but it seems like the 2015 efi and oclp nvme power management fixed it for this one.
The only thing that lags a bit is the left side list of System Preferences when scrolling up amd down, otherwise looks like it runs equal or better than Monterrey
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