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Dave:
I couldn't agree more, but I am anticipating some potential grief from the War Department (her name is Anna). With any luck this won't be an issue, but I tend to plan ahead. You are right, ear plugs are a great answer, hers for the sound of the car, mine for the sound of....you understand where I am headed. That will be my first response. She didn't complain with the 325i convert or the bike, so maybe I am just buying trouble!
What Wolfgang said.

This past winter I replaced my interior with a new set friom Kirk at Vintage. Unless you can make your own carpet set, don't bother with any other pre-cut set---that was my experience. If you are v-e-r-y careful removing your old carpet, you can re-glue it after you get the sound deadening done.

As long as I had the carpet out I did what Wolfgang said--cleaned the pan, painted on two coats of good rustproofing then installed Dynamat
everywhere. Got iot off ebay--still expensive. There are some less expensive materials you can use ---do a search here for soundproofing---anyway I wanted the real Dynamat. None of it is pre cut--it's easy to cut with a large pair of industrial sissors. Then I installed the new carper set. The car looks brand new and is noticably quieter--I can actually hear the radio at 75 now. There's a secret to that too---use foam ear plugs and turn the radio way up. That works well.

I even put Dynamat inside my doors and when they close they sound like a Rolls Royce!

My car did have some rust on the pan that was formed before I got my car sealed up tight. My floors are always dry now.

Good luck with your project---you'll soon see why it's called "the madness"!
Installing a mechanical brake light switch recently reminded me that I installed shop floor rubber padding under my carpeting when I built the car. I got it at Home Depot, it's over 3/8" thick and they sell it in the flooring section (comes on a huge roll - they cut it to whatever length you want). It's cut to fit all of the floor sections - even under the seats - and is glued down with 3M upholstery adhesive (green-ish aerosol can). I also installed a big piece in each door and an equally big piece under the carpet of the "rear seat", plus I used a piece as a "gasket" between the firewall and the engine tin to sel up the engine compartment.

The stuff works GREAT - all I get now is reflected tire noise, a little valve noise and the exhaust note - and the total cost was something like $40 bucks for the car.

I'll be using the same stuff on the new build. It's heavier than Dynamat, but on these light cars, that's probably a positive.
Stan:

Yup, that's the stuff. I found that it takes to 3M upholstery glue like a fly to the ceiling, so I put the stuff everywhere I could. One side is semi-smooth, while the other side has a slight ribbed pattern to it. Even mounted ribbed side in, that glue makes it stick like crazy. You can even then spray glue on the facing side and glue the carpet to it. It made a BIG difference in the footwells up front - took out all of the road noise from the tires.

gn
Road noise? What is that? The SSI's and M&K make perfect road noise.......I'm just saying.....;-)

BTW Bob I understand fully. My lovely wife of 32+ years always complained about my cars except for NAN and the IM-6. NAN was a 64 Pontiac Gran Prix. She has taken to this car like a duck to water. I don't know why but I'm not changing a thing.......;-)

I hope you like your new ride. I do feel somewhat responsible.....
No question, DYNAMAT is the best product for sound deadening. But for those on the cheap, I have read ( but have no personal experience with) that many hot rods simply brush on, or spray, truck bed liner into all the nooks and crannies. It also seems to seal up minor water leaks pretty effectively.
David said:

"No question, DYNAMAT is the best product for sound deadening. But for those on the cheap, I have read ( but have no personal experience with) that many hot rods simply brush on, or spray, truck bed liner into all the nooks and crannies. It also seems to seal up minor water leaks pretty effectively."

I used DYNAMAT on the 356 Sunroof Coupe project and it is a VERY expensive for what you get and VERY heavy but works extremly well.

Henry shot the full underside of the IM-6 with truck bed liner. I cleans up VERY easy. It was a good "extra" cost option.
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