Ulster scored six tries on their way to claiming a dramatic 38-34 comeback victory over Stormers to boost their United Rugby Championship playoff hopes after trailing 17-0.
Ulster ended a five-match losing run in all competitions with a dogged 17-7 United Rugby Championship win at Connacht.
Leinster brushed aside Ulster 43-20 at the Aviva Stadium to book a United Rugby Championship semi-final clash against the Bulls in Pretoria next weekend.
Leinster and Ulster have both announced their teams for Saturday evening's URC quarter-final clash at the Aviva Stadium.
John Cooney slotted over a last-gasp long-range penalty to earn Ulster a 23-21 win over Leinster and guarantee them a place in the United Rugby Championship play-offs.
A last-gasp penalty from John Cooney saw Ulster keep their United Rugby Championship play-off hopes on track with a 19-17 win over Cardiff after being behind for most of the game at the Kingspan Stadium.