Missing SFX on some SCOs

Is it just me or are the Imperial Eagle and Mamba missing engage/disengage SFX for the SCO drives?
My Imperial Courier has a very satisfying punch in plus fuel rush sound on engage and a hefty matching punch out sound when disengaging the drive and I would rate the sound overall as nothing short of awesome. However, in my experience the Mamba and Imperial Eagle just have nothing so you hit the button and then you are just going faster and I would rate that as the exact opposite of awesome.
 
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