i didnt think the stuff was as heavy as some think..i got mine done and i cant sense any change in performance..but its a lot more pleasant to drive..Actually i would not mind a bit more exhaust noise,,just a bit more to provide an added growl..

Check out my prior posts (from the beginning) on the topic, they should answer most of your questions. PM me if I can be of further assistance.

I just weighed the 36 sq ft box of dynamat extreme, 21lbs. Out of the 9 pieces in the box you might use about 6 for the entire hatch area. The rest would probably do the doors.

I started my Dynamat install today. It took me over 4 hours just to do the part in front of the shock towers. I used a little more than 10 sq.ft. to cover that area. There is a bit more trim to remove doing this. I even removed the electronic boxes on the floor and Dynamated under them. I will post a few pictures of the job done so far in my journal.

Noise reduction will be about 2-3 dba. It doesn't sound like much but 3 dba is about a 50% noise reduction so a 2-3 dba reduction will be quite noticeable.

The sand and pebble sounds will be greatly reduced, conversation will be much easier and you enjoy your audio system much more.

I read all the way through and would also share my experiences regarding tyre noise and wheel wells issue.

I have driven the 370Z with Stillen Exhaust and air intakes with the same 20" alloys with 3 different set of tyres:
Falken FK452...oh my god, that is not only a cheap tyre but also so noisy that the sound level at 65mph on a highway is more than annoying even with an Stillen exhaust (on demonstrator car only)
Bridgestone Potenza RE050A...I think that's the same like on the stock alloys. Well, still little bit too noisy to be considered as good (5 days on my car. because I want a wider back tyre I let my Nissan dealer change the tyre brand)
Last but not least: Pirelli P Zero...this tyre is not only more expensive than the Bridgestone and much more expensive than the Falken, it is also much more comfortable to drive and the street noise is now at an very acceptable level for me. Sure I don't like a quiet 370Zzzzzzzzz car therefore we have added Stillen exhaust and intake and even the engine makes a nice deep sound, but the uncomfortable roaring of just some dam cheap tyres is just gone. Sure it will never be sooooo quiet but sorry, that is a sports car and not a limousine.

But in my opinion that is already a big improvement compared to the noisy stock or even Falken tyres....so change your tyres and ask your tyre dealer for a comfortable and quiet one....if not, just bring back the noisy ones.
:iagree:

Second and still annoying noise from the outside of our car is indeed the pebble noise when just picking up each stone one by one or even as machine-gun fire passing some new tared roads...

Nissan's 370Z GT has some suspension modification but they also have done some "extra underbody sound insulation"
Someone has some information about this? Because if they add some extra sound insulation stuff each Nissan dealer should be aware of and could give us some extra parts/info????

I like this topic even sound is like colours a matter of taste so everybody has different feeling and intention with that! But I drive a 99 Yamaha R1 as well so I never ever hear anything else than exhaust, airbox or the engine...and that's good :happydance:

Not to related to cabin noise, but does anyone know how to stop that annoying headliner rattle right by the drivers side window?

Pebble noise: I've said it before but it bears repeating, Dynamat is the your friend.

No tire out there is going to lessen the road debris noise. If the Dynamat isn't enough, I'll spray some rubberized undercoating in the wheel well outside which should be more than enough to stop the tings and pings from everything the tires kick up into the wheel wells.
Tire and road surface noise may still be another issue to tackle. If it is, then I think I will try out a set of Continental Extreme DWS. I have heard good reviews. Since I have less than 400 miles on mine, it is not what I want to do. After a long road trip I have planned for later this month, I may change my mind on it though and change then out.

I am getting those Contis tomorrow..will keep you posted..

I've got the same noise. What is it?

If anybody figures it out, please post up a solution.

I'd like to hear your opinion on the change of the tires. Do you have the Bridgestones now?

Roommate has conti's on his sti... lets just say that they are less than quite...

huh, my DW's are very quiet... :confused: