Bought the product, one gallon. Used the same roads/sections and several runs. Here are my averages for your review. These were taken just after painting and I will have a 7 day, entire car painted report in a week.

25mph in 3rd, 55mph in 6th and 70mph in 6th

Base Numbers
25 - 90db
55 - 92db
70 - 99db

Trunk Painted (3 coats thick)
25 - 88db
55 - 93db
70 - 98db

Doors Painted (2 thick coats, on outer panel)
25 - 88db
55 - 93db
70 - 94db <-- note only improvement

Passenger Floor Painted (3 thick coats, firewall, tranny casing, floor and back)
25 - 88db
55 - 93db
70 - 92db <-- note only improvement

Final Numbers (Everything painted and 7 days to dry)
25 - 88db
55 - 93db
70 - 93db <-- note variance to previous testing

Same DB tool was used while mounted in the cup holder pointing towards the front of the car.

I will be painting the driver's side firewall/floor/back in the coming week. Giving it 7-10 days to set and doing a final run.

Passenger Comment (wife) - noted a marginal improvement once I painted her side (passenger floor). She stated it seemed that less sound was coming from the floor.

DB Tool - says no major change.

I noted - that it was slightly easier to talk while in the car.

 

Think about doing the hood?

 

I did. Cannot seem to easily remove the clips without damaging the heat shield

Thoughts?

 

I did the same. 3 coats on trunk and floor boards. I drove it without the carpet for a week. And notice no difference in the interior but there was less exhaust drone coming in. When I put the carpet back, the difference was there. I wouldn't say dramatic difference but significant enough. Would I do it again? For $76 shipped, hell yeah!

 

Got the liner removed from the hood. Painted. Will provided more info shortly.

 

wow, didn't know the trunk was so big on the S, without the liner that is.

 

Yeah, it appears larger without the liner. But it's not much more space.

Right now, I'm watching the paint dry on the drivers side. I just poured it on this time.

 

How much weight is this adding to the car?

 

8.5lbs if I use the entire container. I estimate 5-6lbs.

I figure we're all a few lbs heavier then we should be so I'm not worried about it.

 

99 to 92 dB is significant given it's on a log scale.

It also gets quieter after it dries.