When you encode your audio, try using Q-Design 2 codec and set for mono, 16bit if you can (8bit will work as well) and 32k or above. You audio won't sound compressed with these settings (much).
I found the problem with the audio, apparently it was something with windows movie maker, used a new program to edit the original clips and you can finally hear the real exhaust. I'll get the new vid uploaded tommarow hopefully
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