I’m looking to reduce road noise and exhaust note in the cabin. I have just getting down this path, I’ve lined the lower trunk and doors. I’ve got 4 sq ft left, I’m thinking the gas tank hump is the best spot?

edit

i had completely forgotten I have a frequency sweep track - I’ll use that to find the weakest points.

 

I laid down sheets of butul in the cargo pan, fuel tank area along with a few sheets on the floor pans and along the trans tunnel. Then one sheet in each door and its pretty reasonable with the windows up. I also removed all the factory jute from the carpets and replaced it with 40oz, that probably did more than the butul though, lol.

 

That’s awesome. I’m probably going to leave the floor pans until I’m ready for carpet. I want to spend a little extra there for heat isolation as well (factory ac delete). I can already hear the difference in a door closing and a nice improvement in subwoofer box performance (no more drone). This should’ve been much higher in my priorities.

 

What I've learned in my own research is that the butyl tiles are for dampening. They work to eliminate the drumming or oil can effect. So as posted above, one tile on each door and one, maybe two o the ceiling will have the desired results.
I went and covered the entire floor pan (the cargo area is still not done) for better or worse. It did however help with the heat transfer from the engine and trans tunnel. Being a racer at heart, I didn't like the addition of another 30 lbs though.
For sound deadening, mass backed/loaded carpet is way the to go also suggested by @exiled350 .
The combination of the two is said to produce to best results.

 

Yes, the weight is on my mind as well - still running the original 5.0 so there’s no excess of power. I’ll likely forgo the butyl on the floor and do good quality carpet and backing in lieu.

 

@skinny z is correct, I slapped them on the floors in areas that looked prone to amplifying noise through resonance. Just a few sheets in total. I don't understand why people think it's necessary to line the whole body front to back, top to bottom. For audio competition I get it because it'll stop the body from vibrating, but driving, not so much.

I work with the production of modern vehicles though and see how they only apply a few patches of sound deadener on the floors, but the carpet backing is super thick foam.