While the fender liners were out, I added some cut-to-fit, self-adhesive, rubberized asphalt, panel dampening material (aka, Dynamat; Brownbread, etc.) to the underside of the front fenders.

If you take your knuckle and tap along the side sheetmetal from front to rear; you'll notice the front fenders produce a more hollow, tinny sound compared to the doors and rear quarters which emit a solid thud when tapped. I believe this is because the front fender panels are more prone resonant vibrations.

As you can see, less than two square feet of the dampening material was used. I literally take my knuckle and tap along each panel as I apply the pieces as needed. The effect is sometimes pretty dramatic. In this application, I don't think it will make that much difference in the cabin because the Jag is a very well dampened environment to begin with. However, I can certainly notice the difference in the fenderwell cavities.

Be advised that this type of material is designed for vibration dampening, not sound proofing. I sometimes see whole car interiors lined with this stuff, and IMO that is overkill. You only need enough to stop the panel from vibrating. Sound proofing is better done using a sound barrier in front and then a second layer of sound wave absorption material behind.

 

Idle time and the mind begins to make up things to do!

I call it, "hey I already had the stuff off, why not!"

 

The law of diminishing returns is probably somewhere in there too.

 

Gordo did the mats cut down on tire noise? I'd like to be able to cut down on the tire/road noise.

 

This material is designed to dampen metal panel vibration, not contain the sounds created by tire contact with the road.

If you want to reduce tire noise, the best remedy is to replace your tires with ones that are quieter. Tires often create more noise as they wear, and if they wear incorrectly, e.g., 'feathering' on the inside edges, it can can be so loud it sounds like a driveshaft or gear whine.