I guess you could dyno-mat the entire floor by ripping up all the carpets and sticking the stuff down, then re-fitting the carpets.

 

For the amount of work that MB put into quitening these things down I would say that 'off the shelf' stuff (floormats etc) would probably not make much difference.

I know what you mean about the road noise because I've had the same issue with my car for the same reasons (low profiles, lowering).

My first thought would be to (either pro or DIY) have the underside of the carpets and inside of the doors lined with a soundproofing material.

Be keen to hear how it goes!

 

I have used Edead V3 in a few cars, mainly on floor pans and above/around/in wheel wells, it's a dramatic improvement even on cars that are already quiet tuned and undercoated. The V3 is a liquid, comes in gallons, paint brush apply and serves not only as a sound blocker but a protective coating to metal as well. Basically any metal that has no barrier and lacks a stiffness will transmit noise. V3 is not so much a mass loader as one may think, it's an actual temperature and sound BARRIER, there's a big difference between mass loading a panel to reduce it's resonance freq (Dynamat) and an actual barrier,(brick wall, rubber mat etc.) Let us know how it goes!

 

I have used Edead V3 in a few cars, mainly on floor pans and above/around/in wheel wells, it's a dramatic improvement even on cars that are already quiet tuned and undercoated...

I like the idea of being able to use eDead V3 in the wheel wells. If I understand you correctly, the eDead V3 will block out more noise than the Dynomat or any other eDead product. Was the improvement greater than the 1db that Bayhas speaks of? Do you know if the v3 is ok for exterior application (on top of the undercoat)?

 

Here's a link to that Edead stuff, so it really works well?

Elemental Designs

 

I would also go for different pattern om tyres..
Thie first 4 pattern makes a LOT of noise :
Compare Tire Search Results

The 5th should be more quiet (depending on rubber mixture.)
Most producers now make tires with similar patterns, as the 5th og 6th.. Because they are more quiet, they are low resistance, fuelsaving and better in general than the typical Michelin Pilot Sport pattern..
I chose 18" because that's the best size for optimum balance between road-noise and sporty driving.. (My guess at least..)

 

I doubt the Dynomat will do a much better job than OEM layers, the car is packed with FLAX from the factory unlike any other factory car, any deacrease will be barely noticable (less than 1db)

also, the car is amazingly holding together even while hitting a good 127db @ 60Hz, the ONLY part that rattled on the outside was the trunk lid, and 4 wood wedges ($.05 each) took care of it.

 

A lot of the road noise that I hear is the result of using low profile summer tires. (preference because touring or all season do not feel as stable based upon my real life comparison)

Not all all-season tires are the same, there is HUGE variation as to feel within the same genre.

Some tires manage to make a good compromise between handling and noise.
Good Year ComforTred has a unique technology. This is the tire for least road noise. You can tune and tweak your 'stability' with your decision as to which width of the different widths available to go for, the quietest would be the narrowest 215/65 R16 but they are made in many lower/wider profiles too.

The quietest tire out there.

 

...
Some tires manage to make a good compromise between handling and noise.
Good Year ComforTred... the quietest would be the narrowest 215/65 R16 but they are made in many lower/wider profiles too.

The quietest tire out there.

I have not tried Good Year but if I recall correctly, reviews re performance did not fair well against all-season tires that I did try... My tire size is 255/35 R20 and my preference is performance over quietness because I am an aggressive driver and need the tires to be sticky in dry & wet. Don't usually do New Year's resolutions but I'm going to try to be more patient while driving and to change my habit of always being in a rush to get somewhere. We'll see how long that lasts.

 

I'm suggesting you to dynomat the wheel wells, at least, or whole car as the best. I already dynamated my front doors(the sound quality's the most important for me) and planning to do it on whole car. This adds about 40-50 kilos. But it worth it, trust me.

 

300E check your under chassis body for loose or lost rubber plugs and other pertinent holes, common entry of sound comes from those area, also check for door clearances and door channel. No matter how much sound proofing you install, it will not resolve the issue, there has to be a hole for noise entry, find it and your noise will be resolved.

 

 

The best option i see is sound proof wheel arches . It mainly fixes all of the problem and replacing with quiter tires will also make a small difference. Also just a personal opinion, use a slightly higher profile tyre you can put a not so stiff swaybar . It will make the car stable