Lots of good advice on this thread.
OP, been in your position, done that. I bought a cheapish second hand Porsche Boxster at 25 (from geo expat classifieds actually). I paid for it outright with most of my available savings which I think was the best decision I made (better than financing it and having to deal with loan repayments). I had it for a few years before selling it and buying an engagement ring for my now-wife.
I don’t regret the decision to buy the Boxster, although now looking back, I wish I had saved the money instead. It was a money pit, I had to put quite a lot of repairs on it (obviously did not do enough investigation), and if I had financed it, the cost of repairs + financing would have been a huge burden to bear. I had a blast driving along the south side with the top down, up to the peak for ice cream, visiting random villages in the new territories which were hard to access by public transport - I drove not because I had to get from point a to point b but because I loved the handling of the car, and would seek out new destinations every weekend just so I could take the car out for a spin.
As the well-intentioned posters mentioned above, there’s a lot of costs that goes into car ownership, including unforeseeable costs, like accidents (may not be through your fault - some guy backed into my boxster one weekend, and it spent a month at the garage), or other repairs at inopportune times. Just wanted to point out that if this is going to be a huge burden financially for you, you may not actually enjoy the experience that much. You would be too scared to take the car out for fear of someone scratching the doors, or if it breaks down and it needs another repair, which could run up to 5 digits. All this takes away from the fun of actually driving it, if you have to think about where the money is going to come from to do the repairs you need, or if you realize you spent a few thousand dollars a month on gas, and its a large part of your income.
That said, if you can afford it, and can comfortably handle the repayments and maintenance costs, go for it. As someone said above, better to get that itch scratched now rather than later. Looking back from where I stand now, I know it was foolish financially to put that much of my net worth in a car at such a young age, and while I was earning enough so that any repairs weren’t too painful, it was painful enough that I did sometimes second guess my decision to buy the car (which was a good check and balance for me).
I sold the car to buy an engagement ring for my fiancé who never cared about what I drove, whether I wore branded clothes or how much I had in my bank account. I can’t say I regretted buying the car, I still think about my twenties with fond memories and I am glad I got the “convertible” out of my system, but I do think about how much the money I used to buy the car would be worth now had I put it in the S&P500 instead over the past 10 years. I don’t have an itch to buy another convertible now - instead looking at soccer mom vans instead, but I guess you could say I am glad I did what I did when I was still young and single.
Just my two cents: YOLO, but remember, the choice isn’t binary - it doesn’t have to be the GTR or no car. As the other posters have mentioned, there are other cars that are as fun to drive but might not cost so much, and make less of a dent in your wallet.
Best of luck with whatever you decide, and if you do decide to buy, I wish you many years of happy and safe driving!