Sound Deadening Options? Options

[ThinAir]

This is me, picking up my freshly repainted 914 from PMB Performance.



Now that it's home, it's time to start putting things back together.

I'm looking for sound deadening solutions for the floor and interior back panel. I'm planning on keeping the interior back panel, but figured this would be a good time to enhance it with some sound deadening capability.

My searches haven't been very successful. I'd appreciate it you guys could offer some advice or point me to previous threads on the subject.

[bradtho]

I've been meaning to write up my project since I haven't seen anyone on our site use them, but, well, you know.

I opted for http://www.sounddeadenershowdown.com/. At a minimum I recommend reading through his site before making your decision. I'm happy to share my BOM, it was definitely more than I needed, so you could bring the price down. The Mass Loaded Vinyl is very heavy so the shipping isn't that cheap.

Basically it's a 3 step process to stop resonance on panels, block vibrations then add a barrier. It's a DIY job.

End result? It's definitely quieter, now I notice how much wind noise we get. As someone else mentioned the rear glass is another weak link. You can definitely improve things, but our cars are never going to be quiet. My doors now shut with a more satisfying/modern thump.

Another bonus is that besides the tiles, none of it is glued in or stuck on, so you can easily remove to inspect for water/rust. If you've gone to the trouble to clean up the tar boards and repair any rust you found, setting it up to do it again seems like a bad move to me.