So I've put about 25 miles on it since I finished earlier this morning. Holy cow, it's a night and day difference. It's only a touch more quiet if you were measuring decibel differences, my untrained ear would say at most it's a 2-3 decibel difference. However, the characteristics of the noise is much different. It no longer seems to "echo". The sound deadening, well, deadens the noise and almost muffles it. I mean, she's no Bentley, but it's so much better than stock Elantra econobox form. I haven't even pulled up the carpet and put material down there yet, either. If you have a couple of hours, some basic tools, and $70ish bucks for the sound deadening material, I highly recommend this project.Hey let us know how this works out after you’ve had a few days to drive it?
Edit: Sound Deadening Material
There's the link to the material I bought. I only needed one 10sqft box for the doors, but you'd need two boxes if you're going to do all 4 doors and trunk. It's only $28/box currently though, so it's really not bad. There's better material out there, definitely, but I wasn't trying to go for silence, just something more bearable.
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