The problem is in Miramar´s engine sound; I´ve done my own sound, but It sounds different, not beamng default nor mine... What´s the problem? I don´t have any other sounpack. I can´t do a video now, but it´s like too "exhaustly" Mine also sounds very low in the background Cheers!!
Would you mind to provide us your files? You may need to modify your sbeam file. Check out this thread and try to use some moderate values.