True, but system integration is a mixed bag when you do. When it is built in originally, you are assured it will work w/ steering wheel controls, etc. On the f

True, but system integration is a mixed bag when you do. When it is built in originally, you are assured it will work w/ steering wheel controls, etc. On the flipside, some manufacturers impose limitations on what you can do when driving, which is annoying, so after market might get around some of that?