It seems when using two or more exhaust pipes it just plays the engine sound twice, creating some really weird sound. I originally posted in beamng’s steam forums and got redirected here so hopefully this is the right place. I made a car just for this post: https://www.youtube.com/watch?v=L9xJio1Js4Q
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We’ve had some reports on that but no idea what causes it, it definitely is not two engine sounds at the same time even when it sounds a bit like it. 
We’ll have to look into that. Thanks for the video, that helps see / hear what is going on a lot better than just a description. Cheers