You can also get a type of car (old man car's) that typically no one thinks there is a stereo in. Like chevy capri classics, mercury grand marquis, buick roadmasters, ford crown vics, ....
Basically, the exact opposite of a tuner car.
And don't put those huge ridiculous stickers on your windshield, advertising you have something worth some cash in your ride.

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My Babies:
04 Triumph Daytona 955i
01 Yamaha SRX 700
00 Arctic Cat ZRT 800