On the internet you can see many things, sometimes opposite, when it comes to sound and heat insulation.
Anyway after some researching I decided to insulate my 2008 C6 for several reasons. The primary initial motivation was the heat insulation of the trunk that gets very hot due to the exhausts just under the trunk.
The secondary reason was noise reduction especially external noise reduction, the reason being that the in Europe noise regulations are more stringent than in the USA. The Corvette is, based on my understanding, at least 3dB above the legal limit.
Although it will be relatively easy to reprogram the engine so that it is a dog, tire noise and body resonance is an issue to deal with.
You can read more on the Euro regulations here
My initial stab consisted in only installing some foam surrounded by aluminium and the final result, whilst being satisfactory from a heat perspective, was not from a sound reduction stand point. Examples of such products are those sold by small vendors such as MadVette.
When it comes to noise reduction there are two aspects that need to be addressed: sound absorption and resonance attenuation (dampening).
Any object subject to vibration, such as an inner plastic panel, resonates and generates noise. The only way to reduce the noise generated by a plastic panel, or something else, is to increase the weight/density of the object. This is a sometimes referred to as a vibration damper.
Installing a sound dampener product is one of the components when it comes to reducing noise, but not sufficient by itself.
In my case, I decided to install DynaMat, rather expensive, after some internet searching. The main driver for the choice was the odour and the reported quality of the product. I purchased in bulk from Amazon
for the sound dampening.
For sound absorption you need a sort of foam, I have tried several products and tested them individually. The only product that is satisfactory and worth the investment from my experience is
For the heat from the exhaust, I also purchased a
that you can stick outside above the exhaust.
An Important Note:
Please bear in mind that you are adding additional components to the car. This will increase the weight of the vehicle and the carpet will have difficulty fitting back in. It will fit but it will be different.
Note: it appears that people have been experiencing issues with MadVette. This doesn't impact the contents of this DIY because there are many vendors who provide such products.
In general do your due diligence before buying, the important part is how to do it, not what products