i tried several pre-made kits and i wasnt impressed with any of them.. ended up making my own from unbacked acoustic carpet. it stretches and bends unlike the stuff in kits.. meaning the front quarters and channels end up with a very neat, tight fit and you can cover what ever you want to cover. it also doesnt fray like most carpet off the roll, so doesnt need binding on the edges.. makes a very clean, neat, install.
oh and its about half the weight of most other carpets..