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Reducing Road Noise in a Mustang Convertible


With the top up and windows rolled up, Mustang convertibles are noisy cars.   The trunk has very little (almost no) sound deadening, and the only thing separating the trunk from the passenger compartment is a sheet of oilcloth (the convertible top's well liner) and a fiberglas panel (the inner trunk liner).   You have to live with a lot more road noise than you do in a coupe.

I decided to look into sound dampening products to reduce this road noise, and I settled on the Dynamat Extreme Trunk Kit (P/N 19405) which contains five 18" x 32" pieces of Dynamat Xtreme sound deadener.   The sheets consists of a paper release layer, a sticky layer of butyl, and an aluminum backing. It can be cut to shape with scissors before peeling off the paper backing and applying it to metal surfaces.

The MSRP on this kit is $140, but I had no trouble finding an on-line store selling it for $70.   There are many cheaper substitutes to consider.   But the alternative products I looked at were generally heavier, not as sticky or easy to apply, and they had a strong petroleum smell.   Dynamat Extreme has no smell, goes on easily, and weighs 0.45 lb/sq.ft., or 9 lbs for the 20 sq.ft. in this trunk kit.

It took four sheets to apply one layer of dynamat to the trunk floor (shown above).   I put the remaining full sheet on the smooth back of the fiberglass interior trunk panel. (shown below).

I don't know if applying this last sheet made any significant difference, but I wanted to make sure that the fiberglass trunk liner does not vibrate and transmit noise like a speaker into the passenger compartment.

I am pleased with the results.   With the trunk liner and mat back in place you can't see any of the sound deadener, road noise has been reduced considerably in my car when the top and windows are up,   and I've only added 9 lbs. to the weight of the car.   If I was buying this car again, this is one of the mods (along with my Tri-Ax shifter and Global West subframe connectors) that I would probably do as soon as I got the car home from the dealer.

found @ http://www.miracerros.com/mustang

There are 4 comments
Henry – Oklahoma
April 10, 2019 - 11:32 PM
Subject: Dynamat Extreme

I just placed some Dynamat Extreme Trunk kit in my 2007 GT Convertible. It works wonders. It filters about 40-60% of unwanted noise into the car. The car was intantly transformed. I only used three 18X32" sheets so far and the car sounds great. No more obnoxious drone and loud tire noise from the back. I was initially very skeptical of this, so I bought about $100 worth of the material. It is well worth the price.

June 25, 2015 - 11:15 AM

Ghanjs for the information

Wayne – Windsor Ontario
September 06, 2010 - 05:59 PM

i know that dynamat has been around for a while now and in the sound business ! this product works wonders, BUT i have just found out a new way to do things.. is the grass greener on the other side.... you tell me.... i just did a project with MDF and had my local LINE-X spray the box and it made it bullet proof. and i like the fact that it sprays on with NO after smell and is 100% coverage into all corners and grooves, so i wonder if anyone here has done the LINE-X int he Convertible trunk to get rid of some of the "NEW EXHAUST" sound from killing you in the drivers seat ! lol feel free to email me if you have done this !! ill be happy to hear your thoughts !

Reply to Wayne
Zac – Minnesota
May 09, 2012 - 04:59 PM

there also is a product called lizard skin that you can either get as a sound deadening liquid or as a heatshield type liquid, sprays on like paint and i believe it is cheaper than linex.

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