Noico is good stuff. I've used it extensively. Made in the Russian Federation lol.
Keep in mind, that type of butyl-based mass-backed material is only necessary in small amounts to be effective. It's purpose is to add mass to panels in order to change their resonant frequency. So 100% coverage is actually overkill and extra weight. Don't get me wrong, I've done it trying to get that "TV show look". Using small squares on resonant panels (knock on them to see) to change their resonance works just as well, and saves a lot on material.
For sound insulation, you really want to be looking at Mass-Loaded Vinyl or MLV. It works really well at blocking sounds from passing through. This is where you want 100% coverage. It's thick, heavy stuff and does not bend well, but it is the best for sound deadening. I used some stuff I found at Lowes that's designed for insulating behind drywall. Nothing sticks to it, so don't expect to be able to tape it or anything, and like I said it can be a pain to form around sheetmetal. It is also recommended to use a closed-cell foam separating layer between the MLV and the butyl Noico stuff. Noico sells this material as well. It's dirt cheap.
Finally, replace your carpet with one that has mass padding attached. It's the finishing touch. And do yourself a favor. Skip the cheap ACC carpet and get their better Essex plush carpet. IT IS SO MUCH NICER.
I did all of this about 5 years ago on my truck (there is a thread around here somewhere) and it works very well. I also used a similar approach on my Camaro.