Has anybody experienced this? Gravel shooting up i the plastic and making loud noise inside the cabin.

Is there a way to soundproof from outside? Thanks

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Yes, use bald tyres.

Serious answer time,

 

Not really unless you want to make a mess of the car, the only ways I can think of would be absorbant material in the arches and that will absorb water as well so a no no.

 

Any car will do this on that surface anyway.

By any chance is it a similar issue to this - I posted this last year and I've had the problem a few times since.  Not sure what the solution is though but it is most noticeable after travelling over a new surface with loose chippings

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http://www.briskoda.net/forums/topic/314425-chippings-in-underbody-protective-covering/

 

 

 

 

You could try a soundproofing kit something like this if it really bothers you.  Not sure how effective it would be for the arches, maybe more on the rear arches...

 

http://www.nkgroup.co.uk/2013/04/30/vehicle-soundproofing-kits-heres-what-you-get-and-heres-why-youll-notice-the-difference-immediately/

You could try a soundproofing kit something like this if it really bothers you.  Not sure how effective it would be for the arches, maybe more on the rear arches...

 

http://www.nkgroup.co.uk/2013/04/30/vehicle-soundproofing-kits-heres-what-you-get-and-heres-why-youll-notice-the-difference-immediately/

 

I have done stage 1 soundproofing: whole trunk, bonnet, wheel arcs and doors. It reduced the noise significantly. Stage 2 to follow: the whole floor.