pkhoury
That guy with the goats
Uhh, they actually do, but it depends on the company. I know Geico will drop you if you admit to having done non-stock upgrades. I have Farmers and they have an aftermarket parts endorsement. I think State Farm might have the same. And I'm living proof that I got paid out for all my aftermarket parts, which worked out, because it was only $560 to buy my car back. And guess where all my salvagable parts went?No, they won't pay you for modifications, fancy stereo installs, or care about receipts for maintenance, but if you can make a good argument for market value, you'll typically see an appropriate response.
Maintenance does help, but on the CCC-one report, it adds maybe $50-100. I've found a lot of insurance companies like seeing things from the past year.
I had a work light fall on a 2003 Jetta sedan I own a while back. I didn't have an aftermarket parts endorsement at the time, but because I had recently installed new stuff (VNT17, .240 injector nozzles, tune, intercooler and yada yada), I got $3800 for the car... that initially cost me $300 on Craigslist.