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Just got a 2016 STI with 10k on it. I had a 09 Maserati Quattroporte S which got totaled when some douche ran the red light. Coming from a well insulated interior to the poor build quality interior is killing me. Everything rattles - turning up the radio the whole back plastic decking shakes, the interior door panels rattle to the point where I can't enjoy the music. I am guessing others have experienced this and have put in extra baffles/insulation to get rid of it. Anyone have a DIY on it?

Thanks!
 

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I got some butyl noise deadening mat....Dynamat in my case.


I pulled out rear seat, everything in trunk including side liners.


Then I roamed around thunking all spots with my hands/fingers. Any area that had
a resonance got a piece of the mat until they all "thudded" rather than "plocked".


The most was in the trunk on the sides and in the spare tire well.....as well as under the
rear window deck.


I also put in Dynamat sound deadening foam (heavy 1 inch think material) under the rear seat and under the carpet in the trunk. However I have since removed it because I don't believe it does much for the low frequencies I was trying to eliminate with it.


This made the rear of the car much less "tinny" in my opinion and didn't add to much weight.....under a few pounds (after removing the heavy mat).


The pieces of butyl were mostly < 1x3inch pieces except the spare tire well (larger) and other spaces that were to small for a 1x3 inch piece.


It isn't necessary to cover and entire area....just put enough mass on it to change the resonant frequency. Try and put the pieces in the center of the area you are trying to fix.



Dave
 

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I got some butyl noise deadening mat....Dynamat in my case.


I pulled out rear seat, everything in trunk including side liners.


Then I roamed around thunking all spots with my hands/fingers. Any area that had
a resonance got a piece of the mat until they all "thudded" rather than "plocked".


The most was in the trunk on the sides and in the spare tire well.....as well as under the
rear window deck.


I also put in Dynamat sound deadening foam (heavy 1 inch think material) under the rear seat and under the carpet in the trunk. However I have since removed it because I don't believe it does much for the low frequencies I was trying to eliminate with it.


This made the rear of the car much less "tinny" in my opinion and didn't add to much weight.....under a few pounds (after removing the heavy mat).


The pieces of butyl were mostly < 1x3inch pieces except the spare tire well (larger) and other spaces that were to small for a 1x3 inch piece.


It isn't necessary to cover and entire area....just put enough mass on it to change the resonant frequency. Try and put the pieces in the center of the area you are trying to fix.



Dave
Thanks for this! Too many people think that you need multiple layers of butyl rubber covering the entire interior of the car... like you said, you really just need enough to change the resonant frequency of the panel and vicinity. If you're going for a competition bank vault, by all means, go for broke. For a daily driver, your recommendation is perfect.

I've used a bit of the foam in-between panels for deadening before, which can help with rattles, if you find the right places. Otherwise, no need for overkill here.
 

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Most of the rattle from the rear parcel shelf is the brake light. I did an easy fix, a spring clamp from home depot through the wire hole clamping to the steel from inside the trunk. when it rattles again I know it has slipped. Another rattle is the inside trunk lid lining. I took it off and glued foam to the back and put it back on. I feel your pain about the lower quality, before my 18 I had 5 Mercedes and an Audi.
 

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If you REALLY want to go all out, go to sounddeadenershowdown.com.
I will say this though, allow over a week to get everything done. (2 weeks for me, but I'm slow)
 

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Have you considered trading in for Audi A4? They have manual and it's very similar to STI except the HP numbers. Spending money and effort to fix noise on a Japs car is not worth the hassle.
 
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