https://github.com/mamedev/mame/commit/c89891e4aa3746da8d3f325a6e4db5bd1468e1c8 fixes the overtake flickering. The pcm audio doesn't work though (the fm music does work if it's enabled in the menu). The walls beside the track which don't appear in XM6 seem to be in real hardware videos so AFAICT they aren't a graphic error.

[Linked Image from i.imgur.com]