[2] He later joined Eggenberger Motorsport and finished as runner-up in the series in 1988 in a Ford Sierra RS500 Cosworth, enjoying many on-track battles with Andy Rouse in the process.

Soper had led the championship for most of the season but a run of bad luck towards the end of the year damaged his title challenge.

Soper raced in the German Super Tourenwagen Cup in 1996, challenging for the title until an incident late in the season with his team mate ended his championship chances.

Soper finished fifth driving a Ford Sierra for Eggenberger Motorsport in the one-off World Touring Car Championship in 1987 run under Group A regulations.

That year, he won the Bathurst 1000, but was later disqualified for a technical infringement[5] Soper was offered a works drive for BMW, and competed in the night European, Japanese and German Touring Car Championships.

In 2013, Soper, who had earned the nickname "Soperman" (with final syllable stress to sound like "superman") from his fans during his career, announced plans, on medical clearance, to race.