He won the Speedway World Championship in 1983, winning the title in his homeland with a maximum score of 15 points.

[3] Despite him only appearing for a handful of meetings in 1976, Hull were granted a 'Egon Muller (Rider Replacement)' facility for the entire 1977 season.

Following the 1983 World Final, rumours surfaced that West German officials had given Müller extra practice time on the 400 metres (440 yards) Norden track that the other riders were not given.

In commentary for British television, 1976 World Champion Peter Collins noted that the Motodrom that day was more like a Grass track than a regular speedway which definitely suited the West German.

Just two weeks after his 1983 World Championship win, Müller was reportedly involved in a motor accident on the Autobahn where he wrote off his Porsche.