New speakers or new car?

Most of the cost of high-end speakers comes from (1) the cabinet, (2) marketing, and (3) dealer markup. Although high-end speakers are typically not mass-produced and are therefore more expensive, the dealer markup—especially for imported models—is quite excessive. You’re essentially paying for their retirement. Not worth it.

The car is more important if its your Primary transportation but if its a basically unused spare car the get the speakers!

These days, it is almost better to ask…new speakers, or a new house? 
Depending on what part of the country you live in, there are new speakers from the usual suspects that are priced at or above a house!!

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My last five car purchases have been two that have maintained their value and three that have appreciated.  That doesn't happen with speakers.

I have never bought a brand new car.  I recommend buying one 1-3 years old with low mileage.  Check Consumer reports for the most reliable cars.   Save the money for stereo upgrades.  If you have to decide between speakers or car, don't spend $50,000 on speakers.