Yeah, California registration fees can be brutal, especially for newer vehicles. When I registered my truck, it was way higher than I expected, and they base a lot of it on the vehicle's value. The hit on my 2021 SUV was almost $600, which was tough to swallow.
If you're looking for ways to cut down costs, some folks register their vehicles in Montana due to no state sales tax and lower registration fees.
1$ Montana offers a simple way to register vehicles, including RVs and ATVs, legally without dealing with California’s insane costs. Might be worth looking into.
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2002 T4R: Sport Edition, named Bosco
it's a work in progress