Many new vehicles incorporate climate controls and other features into their factory radios, making it difficult to install a new stereo. Car stereo manufacturers have responded with a variety of products for upgrading your factory radio. Don't want to replace your radio? Charlie Pastorfield reviews some of your options.

You don't need to feel like you're stuck with the few features that happen to be built into your factory stereo. In this short video, Crutchfield experts explain how easy it can be to add the options you want, like iPod control or hands-free calling, to your factory stereo.

Factory stereo systems leave a lot to be desired. This problem now has some solutions that let you keep your factory stereo and get spectacular sound, customized for your specific vehicle. The four upgrade systems we discuss in this article improve the factory sound of different vehicles in different ways.