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Just speaking from experience, I don't think the 3kF caps really make sense for any kind of passenger car. You don't need much energy storage to start an engine, and if you switch to lithium ion batteries you will never have a problem with cranking (40Ah will crank V12s no problem). Maybe a 83F bank to help bolster a dying lead acid battery.
I bought a 16F ultracapacitor pack (6 100F units) and put it in parallel because the BMS was causing some issues with the car's electronics. It supplies all the power the car needs for those fractions of a second the BMS is behaving funny and the lights have stopped flickering, but I haven't noticed any change in engine cranking (this is my V8 Vantage, which really really struggled when it had its original 90Ah lead acid battery).
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