Brand-specific Car HiFi are important accessories for improving the car's sound world. Car manufacturers think of tuners as well as improving the car afterwards with various accessories, keeping in mind production efficiency and fitting their own accessories to the car. A very good example is Toyota, whose front door speakers are attached with three pop rivets. Standard-sized speakers cannot be installed until the old speaker mounts are drilled open and the new speaker adapters are put in place, fortunately these can be secured with screws for possible future use.
In addition, some manufacturers may have their own tunings for attaching and connecting the car stereo, in particular, owners of steering wheel guides should check to see if they can get steering wheel guides connected to the new car stereo.
In many brands, you have to consider attaching a radio antenna to a new player. Surprisingly, many brands do not have a standard-sized antenna mount, you have to buy a separate adapter for these brands in order to listen to radio channels in the car.
In addition to functionality, many manufacturers have a special dashboard adapter for the car player, a new player can look really bad on the dashboard if you don't buy a brand-specific adapter kit to make a standard-sized player look good.
Also noteworthy is the ability to upgrade from a 1-Din player to a 2-Din player on some models, conversely it is also possible to upgrade but it is a much less desirable feature.