I thought everyone had a spreadsheet?
I had to do one for insurance purposes, I had an agreed value policy on mine for $90K..
I bought car in 2018 new with 5% off MSRP for 57K and had exactly $39,125 in mods..
Was one of the most fun cars I have owned ever and enjoyed it for 5 years.. sold and jumped into a 991.2 GT3..
Zero regrets modding the M2 to that level, would have taken it over any other $90K car. I still own some other fun BMWs with a lot of mods on them, also with spreadsheets for those since they have agreed value policies also.
For the GT3 I have no spreadsheet, since it basically needs no mods, other than muffler deletes.