I know it's tempting to dub sounds, but my recommendation is "don't", because it is apparent even if technically accurate (right prime mover, etc.) due to acoustics not matching the scene. This used to be done all the time with 1:1 railfan videos such as Emery Gulash's 16mm footage, and it's painfully obvious especially to folks who have been there, "I see an Alco, but that's not what they sound like," and so on.
Sort of like cheap porn vids. Her face says she's in too much pain for "yes, yes, YES!"
