No, I did a single layer. I ordered 10sq ft of damplifier, and one sheet of luxury liner first. The damplifier only really covered the center section below the spare and some of the strut towers. Didn't make enough of a difference so I added the 13sq ft package of damplifier pro (if I had to do it over again I would have used all damplifier pro). I used that on the wheel wells, the rest of the strut towers, the riser between the spare and the small front compartment, inside of the fenders around to the tail lights. Only place I really didn't cover was below the hatch opening in the back. I don't think the weight was more than 20lbs and it made a difference on the sound levels. Not perfect, but not willing to invest more in it as I think its diminishing returns at this point. Also, with the back quiter, I can now hear more noise from the passenger door (though with passengers in the seat you don't hear it). I am unsure if I am going to do the doors.

Not that much weight IMHO, but much more comfortable with the noise.

Well, I dunno, you can see from the pictures how much area I covered with about 22 SPL tiles.

I want to do this to my rear hatch, how thick is this stuff 1/4", 3/8", 1/2", 3/4" or 1" ??

It depends on which material you are talking about. You can get measurements at Sound Deadening Materials for Noise Reduction from Second Skin

All I can tell you is that I used all of it, did not double layer anywhere, and covered everything I could except the very back of the hatch without any left over. Glad you started this thread, because it helped me get the car to a better place sound-wise.

I did it with some cheapy material from China. It really kills some of the sounds, and it has a great improvement on the BOSE subwoofer!

After the installation, most of the noise come from the floor and tires, which I have no idea what to do about it. +_+

/\ you can spray undercoating to the wheel wells and interior trunk area, this would so much lighter than adding sound deadening material like dynamat.

great diy, im will be doing my trunk and doors soon

I already replied to your thread about it, but I'll copy/paste my response here:

Well, I pretty much already voiced my opinion on this, but I've always felt that Dynomat is overpriced and pretty much the same as the rest of the sound deadening materials. Although I really haven't compared prices between them and others recently, so perhaps their prices have come more in line with other companies.

Second Skin definitely seemed like pretty high quality material, at least compared to Elemental Design's. I like ED's products a lot, but Second Skin's quality of deadening material seems way better.

Hi All - This is my first post here, but I used to be active on My350Z.com. I'm hoping to bring this thread back from the dead, as I'm about halfway into trying to quiet down my '03 Z.

Flashburn, do you still have the pictures from your original post? If so, I would be interested in seeing how your install progressed.

So far, I covered approximately 75% of the hatch with B-Quiet Ultimate. I also fit 2 sheets of Second Skin Luxury Liner Pro (LLP) in the hatch, which covers 90% of the surface area. I also worked in some B-Quiet and LLP in the cubby behind the drivers seat.

The car is still very loud, but haven't had a chance to secure all of the material properly or reinstall my interior. Unfortunately, I also managed to bang up the wiring of my 4-channel amp during the install, so I can't comment on improvement to audio quality yet.

Next steps: Work on the door panels and the floor (if I have enough material) and reinstall the interior. I'm considering ordering the Second Skin Spectrum to spray in the wheel wells and hatch, but I'm hoping that I wont need to do that.

Old thread brother, I have some pics in my photo albums, FlashBurn sold his car and sporting a Corvette now. My car used to be his, check out the Build thread and I have some sound deadening stuff there. http://www.the370z.com/members-370z-...h-journal.html

I did the floors, doors, rear trunk, support area, and removed the aluminum heat shields from underneath the car and sprayed Eastwood Sound deadening all under the car. Much quieter now. I still need to do the roof.