Adding propulsion sound on Flash trim?

[Robocop]

When I first got my truck I thought the propulsion sound was kindof cool but then I realized that eerie bank-vault type experience of quietness / silence in the cabin is much more dramatic I switched off the propulsion sound and haven't used it since.

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[Wendy]

Sometimes I want a V8 vroom revving sound to get the noisy guy next to me excited, and then I can just take off silently.