Could I get rid of some road noise if got my 88 conv. undercoated ?

 

Not sure but it could only help, if anything. There are spray cans of stuff you can use if you want to try it.

A lot of times I have noticed more road noise in cars it has been from tires that developed subtle imperfections. Speed rated tires can be worse about this as they are made from different rubber compounds than regular tires.

 

A sound deadener like Dynamat will do the job. But it is a major chore to install it as the carpets must be removed to do the job properly.

 

Thanks, I'll look in to it more.

 

Remove the inside trim panels on the doors and carefully spray in rubberized undercoating on the inside of the door skin/sheet metal. I get the "low odor" version if possible. In addition to killing some noise it made my doors shut with a nice solid "thunk" too.
I saw a huge gain in road noise and cat-back drone at highway speed just by dynamating the spare-tire well (resonator) on my FD. And that's pretty easy to get too. But doing the entire floor and tunnel would be better.

 

There's something I've been wondering: Does the upgraded sound insulation on touring FDs include something in the doors also? In shopping for my FD I drove a base car. The doors sounded "tinny" or hollow, I would say when you close them. My touring does not do this. Just always wondered about this.

 

AFAIK, there is no difference in what insulation MAZDA installed regardless of Base, Touring or R models. Nothing was "upgraded" over any of the other models in the Touring. If there as a difference it was probably something an owner did similar to what I just suggested.