[FatBoy]

Thanks for the suggestions.

The elliptical shape of the exhaust exit due to the turnout makes adding anything onto the end problematic and I don't want to change the original appearance too much.

One suggestion has been to modify the tailpipe section so that the outlet can be rotated to face the ground when being used on the track. This could easily be achieved, but I don't know how much effect it will have on the noise levels. But maybe used in conjunction with some of the other suggestions, it could be enough.

Thanks again.
Paul