I would say “let the kid live a little he’s only 18” if his insurance was’t as much as it is. He’s paying more For his Si than my rent costs for a 1 bedroom apartment. I was driving a car worth nothing when I was 18 and had no income. He must have a damn good job for an 18 yr old.I'm not trying to be mean, I'm only trying to help. I know people with house payments less than what you're paying for your car+ins etc. You're never too young to start making smarter investments. In 3 years you will have paid out $26k in lease/insurance payments and have absolutely $0 (nothing) to show for that.
To put your purchase in perspective, Im also looking at buying a Civic Si; Im 41, no house payment, $110k+ income, and $0 monthly debt. My car payment on the Si will only be $275 for 48mo @ 2.9% ($12.5k down payment from my wrx trade $12.5 financed).
I could pay it off, but im going to gamble that i can make more investing the money instead. Insurance is $125 a month. Sell your car (you can easily drive something as fast with less insurance costs) and go buy some property, or invest it. I wouldn't even have a $400 car payment with my income, let alone a $400 insurance bill.