any bodu have any idea how thoose things work and if it was possible to fit one inour Celicas ?

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its not speed sensitive, its noise sensitive and i had it in my pioneer premier headunit, it has a built in mic and as the noise around you goes up (driving faster, construction, etc) the volume adjusts accordingly, most high end units have it as a feature and some of the cheepies too, you just have to shop around, my head unit was about $650 new

wow , lol , did'nt know that and never thought it would be that simple either ! thanks !