Adding increased insulation while you're already working on the interior as part of replacing the carpet or door panels doesn't require a lot of effort, but it's a small improvement you'll get to appreciate regularly. A quieter interior means you'll hear music and conversation better and be able to go faster without hurting your ears.

You'll also improve your temperature control. Heat and cold can both damage your interior parts, as well as anything you leave inside.

There are many different styles of underlayment. The first style is just a simple, standard asphalt layer with a needled cotton backing, much like the original found in classic Mustangs. There are also upgraded options that resist condensation underneath. Dynamat is one of the world's top insulators and features high-efficiency sound deadening and temperature-controlling materials. It comes in kits that you can use all over your Mustang, from underneath your carpet to the door panels, to the headliner.

Improving little details in your Mustang's interior can make your ride even better and make sure you enjoy every drive.