Eng continued at JICA level in 2004, finishing seventh in the Margutti Trophy, and 31st in the European Championship.
Eng finished in the top ten of both series, ranking ninth in the Open Masters and tenth in the Italian Championship.
Eng finished tenth in the championship and runner-up behind Jens Klingmann in the Rookie Cup,[1] with a podium coming at the third round at Lausitz.
[2] Eng did make up for this in some aspects by winning the end of season World Final from pole position.
Having switched to Mücke Motorsport, Eng dominated the race before leading home Wittmann, Klingmann and Sebastián Saavedra.
Eng completed his FBMW career by driving for Mücke in the inaugural season of the Formula BMW Europe championship.
Eng switched to touring car racing for 2018, competing in the German-based Deutsche Tourenwagen Masters series with BMW Team RBM for three seasons.