How do I add sound to a Vehicle?

I have modified the "ghost" which is a vehicle from the game Halo. It doesnt require a tool in your inventory, It moves and shoots but neither one of them have any sound I would like to know what is it I can do or how I can add sound to these I am also doing the same thing for the Wraith and Spectre from Halo 2. Im trying to modify it to have sound the link or set is below as well if you want to check it out.

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