I wonder how much it costs to insure a lowrider?
THAT, of course, depends upon the particular lowrider in question. Are you talking about a Good Guys custom classic Ford '49, chopped, channeled, shaved, painted, and polished down to the very last valve stem cap?
...or...
Are you talking about that rusted out '63 Impala with the "bicycle tires" and the blown stereo speakers that rattles and clanks along with the mariachis blasting half-drunk out of the driver's window that doesn't roll up anymore?
In the first case, you're talking about a very special type of insurance that is based primarily on "Actual Cash Value" established on the appraisal of highly qualified experts. This insurance is the most expensive.
In the second case, you're talking about comprehensive insurance; coverage that takes care of everyone's injuries and other people's stuff. Getting this kind of coverage is about as low-budget as you can go.
Of course, anyone who puts $10,000 in aftermarket stuff into a $25,000 vehicle, would be smart to discuss it with an independent insurance broker who could provide advice about whether "off-the-shelf" coverage is enough and, if not, what additional coverage might be in order, from who and at what cost.