Bedlining under the Trunk
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This is a discussion on Bedlining under the Trunk within the Exterior & Appearance forums, part of the Tech & Modifying & General Repairs category; Just wondering if anyone knows if bed lining under the trunk would help eliminate exhaust drone? Has anyone tried it?...

  1. #1
    Registered User anpato's Avatar
    Join Date
    Jun 2012

    Bedlining under the Trunk

    Just wondering if anyone knows if bed lining under the trunk would help eliminate exhaust drone? Has anyone tried it?
    2013 SWP WRX Sedan
    Hillside, NJ
    Invidia Catless Downpipe, Custom Short Ram Intake, Self Tuned Using ECU Flash, Romraider and Tactrix

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  3. #2
    and the Funky Bunch Calvinball's Avatar
    Join Date
    Jan 2012
    Philly Area
    Not sure, though I believe that people have dynamatted or used other such sound deadening materials on the inside (not sure if that's what you meant by "under the trunk") of the trunk/hatch to reduce drone as well. No idea how effective that is.
    - Will
    First Mods: What to do and what not to do
    Current Car: 2014 Golf TDI
    Previous Cars:2012 WRB WRX Hatch, 2004 RSX-S, 1998 Grand Prix GTP
    "Isn't it amazing how smart you feel when you just aren't being stupid?"

  4. #3
    Registered User tirerob's Avatar
    Join Date
    Nov 2012
    bug-eyeing in the Bakken
    Tried it just last week. Three bottles of pickup bed liner plus heavy dyna mat works great together. IMO, either isn't quite enough alone. Killed a lot of high pitch road noise and most rear diff whine. Hasn't helped with exhaust much cause I'm stock. Also helped tone down nvh from full bushing replacement(tic, energy suspension, kartboy). I like it, going to finish Dyna matting the front seat area and doors soon. That should make a difference too
    when my friends come up, i hear, "you sold the camarrrroooh.....HOLY BLEEP A WRX!"
    Ya has that effect on me too.

    Where did he go??

  5. #4
    Registered User SKI.WRX's Avatar
    Join Date
    Jun 2010
    You don't want truck bead liner, you want sound deadening spray undercoating. Also comes in brush on form if you really want to cake it on. That's what they use at the factory to give the under body that rubbery feel. It foams up slightly rather than solidifying into a solid mat of rubber so it uses the trapped air to reduce sound transmission and the rubber helps to dampen the body work and reduce vibration induced noises like gear whine. Dynamat is not meant as a sound blocker, it is a dampener for vibration type noises and will help only slightly to reduce exauhst drone or road/wind noise. That's where closed cell foam is best.

    Last edited by SKI.WRX; 08-03-2013 at 11:07 AM.

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