The change to Magnaflows had two edges to it. Sound was that of a proper sports car and the resonance and droneing made my wife consider earplugs, if not one of those noise canceling headphone sets. As for me, too many years of motorcycle racing with two stroke expansion chambers and electric guitars have conspired to make hearing too much of an effort to ignore anymore.

To say that there are many opinions on where and how to start with sound deadening would be an understatment, but most seem to agree that the trunk area makes sense. I ordered a roll of B-Quiet Ultimate and went to work this morning. My wife was out pretty much all day so she wasn't privey to the effort I was making to deaden the drone.

Since I have not been able to find my RS sound meter for a month or so (might have loaned it out), I wasn't able to take "before" readings. OTOH, I still can't find it so I can't take "after" readings either.

I stripped the trim material in the trunk and removed the spare. Virtually everything I could get to got covered with the B-Quiet, including under the spare. In addition, I put large patches on the inner walls of the rear fenders. Finally, I put a layer on the trunk lid.

When my wife came home, I asked her if she wanted to take a run to the store with me. She agreed and we didn't get 50 ft. before she remarked, "did you do something to make this thing quieter?. Who needs a sound level meter when a wife can pretty much say it all?

We did top up and top down, with and without music and the difference was remarkable. The droning is improved to the point where my wife now feels that sound discomfort is no longer an issue. The exhaust note seems a lot cleaner now that it is not being accompanied by Gong Show gonging.

Phase II will be a coating of Quietcar liquid on all of the B-Quiet material. Then it's on to the passenger floor for both B-Quiet and a coating of Quietcar. While I'm at it, I might do both sides of the hump.

This has been well worth the effort so far and I am looking forward to getting further reductions in Phase II.

 

Don't overlook the floor area under the driver's side as well. While the passenger side has the exhaust (highly significant source of noise), the driver's side has plenty of road and transmission noise that contributes to the overall sound level as well. I did my trunk pretty much the same as what you described (although with Dynamat eXtreme) along with 3 coats of Quiet Car and the followed that by doing the same on the floor under both the driver's side and passenger side of the front.

I also have added some dynamat to the door panels on both sides.

 

[QUOTE=AlanL,Oct 16 2005, 08:16 PM]Don't overlook the floor area under the driver's side as well.

 

The 3 coats of quiet coat for both the front end as well as the trunk was done with a single gallon. I used 2 "door kits" of the Dynamat in the process.

Here is a link to a quick web page I made up to show another S2k owner the process/results on the driver's side. This link isn't exactly 56k friendly however:

http://www.lichty.org/MiscImages/S2kSoundproofing.html

I ordered the hardtop for my car when I took delivery last March and got it in early May. I guess I slipped under the wire just before they killed production.

 

How much would a trunk and door kits weight? This stuff isn't light, but I'm sure it isn't remarkably heavy.

 

Shipping weight for one door kit of the Xtreme product is 10lbs, so I added somewhere just under 20 lbs with the 2 door kits worth of dynamat. I bought the door kit so I could get 4 12" x 36" sheets. I managed to get a lot of the open spots on my doors, pretty much all of the trunk area and most major open spots up front under the carpets. I was sort of running low by the time I got to the driver's side and the pictures show what was left of my stash.

In another thread in this forum, someone calculated the weight of one gallon of Quiet car at roughly 7 lbs when dry.

 

So you were able to get both doors and trunk with just the two door kits?

IBconfused

 

Yup - I think the dynamat door kit is for something like an Escalade and we don't have anywhere near that kind of sheetmetal acreage in our cars

 

How much quieter is the car with all of that sound deadening material? My car is still stock but I feel that most of the cabin noise is coming from the front of the car, from the engine compartment.

 

An awful lot of it is engine noise coming through the floorboards - esp on the passenger side. The big lump in the passenger floor is the exhaust system and it has little to no sound deadening material on it at all. The other main source of the sound is the transmission tunnel and the Quiet Car makes a huge difference there.

The trunk treatment helps somewhat, but nowhere near as much as the interior floor pans.