Hi, I just got done doing a soundproof attempt ot my audi TT. Its not completely finished yet but heres a few pics at the bottom.
I used fatmat which is cheaper to dynamat, I doubled layered it all over the car, roof floor, doors, trunk, just not firewall. and it significantly reduced the vibrations. On top the fat mat i layered everywhere with dynaliner or carpet jute (padding) to deaden the sound.
I also, which Im starting to regret dearly stuffed all the internal body frames with carpet padding then sprayed great stuff all inside to to adhesive it to feel solid rather than hollow echo vibration.
Now while I feel I almost eliminated all the outside sounds, my suspension and tire noise i feel has increased... like twice as much, the annoying thing is i hear it even with my windows down.
The big issue I have is my car sounds like it has cheap rims on it, but there the stocks and before i never had this issue. tires are sport v12s, but dont remember them being so loud.
So any ideas what i can do to resolve this? do you believe filling the body structure gaps with great stuff caused this??
I cant decide if the eliminated vibrations and outside noises opened just enhanced the road noise, or the fatmat, carpet padding and foaming the stucture pockets incresed the road noise.