I unfortuantly do not think there is, The sound is tied in with the engine sounds as far as im concerned. I guess the only thing you could try and do is get a audio mixer programme and try and mess around with the sound frequency levels to try and make it more realisted, but i personally do not know if that can be done.
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Jamie Marsh's post in Anyone know if you could simulate the radio sound so it sounds like its coming from the speakers? was marked as the answer