In 2008, he returned to the 24 Hours of Zolder and Belcar GT with AD sport, racing alongside future Porsche Factory driver Laurens Vanthoor. The 2009 season saw his final attempts at the 24 Hours of Zolder and Spa, resulting in a DNF with AD Sport, and a fourth-place finish with Prospeed Competition, respectively. In 2011, Heylen returned to Prospeed Competition, with co-driver Petri Lappalainen, and the pair earned four top-ten finishes in twelve events, with a season-best of seventh place at Zandvoort, concluding Heylen's full-season efforts in Europe.
In 2008, he rejoined AD sport for the 24 Hours of Zolder and Belcar GT, racing alongside future Porsche Factory driver Laurens Vanthoor. The following year saw his final attempts at the 24 Hours of Zolder and Spa, ending in a DNF with AD Sport and a fourth-place finish with Prospeed Competition, respectively. In 2011, Heylen returned to Prospeed Competition with co-driver Petri Lappalainen, achieving four top-ten finishes in twelve events, culminating in a seventh-place finish at Zandvoort.