sound deadener recommendations

[smh00n]

I need to put some sound deadening mat under the rear seat. Have mufflers ending under the diff so a bit loud.
There's cheap and there's dear - anyone recommend one that works?
Ideally I'd get cheap and works but if dear and works is the answer so be it.

[hybrid]

I used both dynamat and a cheaper alternative in my car. There's threads about it on here somewhere because people were saying that the cheaper stuff will catch fire, but I actually set fire to both and there was very little, if any, difference.

[hybrid]

I found the thread. This was the mob selling it:
https://www.solavis.com.au/collections/products

It seems they don't list the acoustic insulation anymore, but maybe you can reach out to ask.

[smh00n]

Thanks.

Hoping/wondering you set fire to the stuff BEFORE you installed it in the car