Sound Proofing Car

What is the best material for sound proofing against drone and road noise?

Loud music and/or a better sounding engine?

protip, it's a lot better to soundproof as close to the source of noise as possible, so do the outside of the car first
undercarriage and the exhaust itself

Yeah makes sense, what material would you recommend?

dynamat or something

rubberised bitumen works well
on the exhaust you use heavy magnets to suss out the harmonics then weld on weights
kinda like balancing a wheel.
sometimes an extra hanger or two helps too

>What is the best material for sound proofing against drone and road noise?

3M makes a very thin soundproofing material that is basically a thick foil sheet of soft metal with thick adhesive. It seems to be much improved over the old 1970's technology of rubberized bitumen sheets (dynamat). But certainly dynamat is much cheaper and easily available. 3M sent samples to me and it is quite impressive. You don't have to cover the whole surface like with Dynamat in order to get detectable improvement. It is almost like it sucks in audible vibrations from the nearby metal on which it is stuck to. A 3x5 sheet of steel rings loudly if struck, but if a one inch by 2 inch sample strip is put on the back, that sheet makes a dull soft thump when struck.

The places where the cabin box receives road noise from the wheel suspension structure seems a likely area to start with 2552. I wonder if 2552 was named that way to be easy to remember. At least they didn't name it Damping Foil 1337. That would be over the top. Anyways, I am quite pleased with this product. Dynamat never seemed to reduce the noise that much in my previous car. If only taking the car apart to install sound deadener didn't take so long. I was afraid to break things because there are so many connectors to everything (even to the seats).

Google it: 3M Damping Foil 2552

>What is the best material for sound proofing against drone and road noise?
The fat and organs of liberals.

Why the fuck would you want to take away one of your senses while driving? Being able to hear saved my ass once and my engine another time.

>bought a tin of sound deadening tar or whatever it is
>go through 6 paintbrushes applying it to the underside
>learn later on you're supposed to lather it on with a Trowel