Although I cover the floor in dynomat, I still use jute over top of it to smooth out the floorboard. It creates a better look in my opinion with a layer of jute in between the carpet and the floor. I order my carpet from ACC by the yard when I can't order one already molded. They have two types. Ask for the carpet without the plastic backing because it's much easier to work with.

Absolutely use jute padding under the carpet. It not only provides noise and heat protection, it helps protect the carpet from damage by softening the metal floor of the car. (I assume that the Cobra is a fiberglass body)

Dynamat should be installed prior to the carpet pad. It also adds to the heat and sound deadening of the cab. Jute padding can be glued directly over the Dynamat without any problems. The carpet can also be steamed to further smooth any wrinkles and that will not affect the Dynamat either.

Good Luck, if you need any further assistance you can message me.

I agree with both above.

Just a heads up... watch out which butyl brand material (dynomat) you use directly on the floor pan. I have 4 different samples of various brands stuck to a steel cabinet in my shop. All are fine except the Eastwood brand. It melted and fell on the floor. That could create a huge mess in a nice car.

With the carpet I generally buy from a few dif. places.

- less expensive option I buy from my reg supplier. Quality is ok
- better option is ACC or Trim parts. Carpet is better quality but many times they only have the poly/stiff backed carpet available.
- best (my opinion) GAHH this carpet is more expensive, but the look and quality can't be beat.

Thanks all!

Here is a pic of Eastwood butyl vibration damper that i mentioned earlier. Out of multiple brands only the Eastwood brand melted.

Regarding butyl sound deadener falling off, try spraying a light coat of contact cement first onto the sheet metal or fiberglass and let dry. The glue has to be well dried for this to work but it will never come off , ever.
I use Hushmat which is a little cheaper but works well for the money. Give it a try and see for yourself, it's a bit of insurance against the stuff falling off under a headliner in summer. ( not the Cobra)
As for carpet ,what everyone commented above is bang on. The Cobra carpet is done in multiple pieces like an English car with bound edges but has no compound curves, so whatever is stiff enough to be bound and can be bent over the tunnel will work.

That's a good tip Geoff
The problem with the Eastwood was not the adherence to the cabinet but the butyl itself melting. It stuck to my cabinet just fine, then melted and slid down 4-5" till it just fell on the floor, leaving a gooey mess behind. can you imagine that dripping through the drain holes in the door of a $$ car? It may have been a one off problem, but I'm not willing to trust a customers car to a product I have witnessed failing.

Good to know Andy!

as far as sound deading, hushmat extreme is ok, but i only use second skin. stuff is phenomenal they even have a close cell pad that works wonders.

dynmatt is like nike, your paying for a name that has half the science that these new companies put into sound deading.

Ya dynamat is ridiculous, I'll check out second skin but usually options are limited where I live, if I don't want to wait 2 weeks.

Dynamat is too expensiv, you pay too much for name. In trade exist a lot of similar deadening materials. I (in Europe) use russian STP, it works great (I wrote that russian army use it for their tanks :-D - so itmean that it's tasted for wide range of the temperatures) and price is much much better.
For noise and temperature dampening I use 8-15 mm closed cell foam with self-adhesive layer. It's better than jute. It's very light and work much better.
I use carpets from UK Coverdale whith latex rubber backing. How do you sew 2 pieces of carpet together? I sew them about 1 cm from the edge, but it has happened to me that when I munted it in the place of complicated curvature the surface the seam ripped from the carpet and the carpet split :-( How to prevent this and insure the seam?