Forget all this noise, go to racing junk and get yourself an actual race car in the budget that fits you that you can just maintain rather than keep "building". A CT5BW would be fun to shred the tires on, but will be a compromise car. If you're ok with that, it might not be a bad choice.
Factoring depreciation and consumables I'm gonna guess it's going to be a wash compared to keeping that E92, but more expensive when it breaks.
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Oy vey, look at all these shekels
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