Lafitte's side have endured a difficult start to their Betway Premiership campaign with just three wins from their opening ten games.
Their recent 2-1 victory over Chippa United ended a run of six games without a win, and they followed that up with a surprise one-side showing against Stellies.
A brace from Phillip Ndlondlo and further goals from Monde Mphambanisi and Edgar Manaka sealed a fine performance at the Dr Molemela Stadium on Wednesday, and a semi-final clash with Golden Arrows - who they also face in the Betway Premiership on Sunday.
Lafitte said in the Sowetan: "I am so happy because it's not easy to qualify for the semi-finals of any cup competition.
"More than anything, it's the fact that we didn't concede a goal that makes me happy. It also pleases me that we managed to score four goals.
“My boys did a very good job. This is a very important result for us. The game plan was executed very well tonight; hence, I give my players credit.”
Orlando Pirates clinched the Carling Knockout Cup in dramatic fashion at the New Peter Mokaba Stadium, edging Marumo Gallants 1-0 after extra time to secure their second trophy of the season.
Marumo Gallants' goalkeeper Washington Arubi says his side is comfortable being labelled the underdogs ahead of Saturday's Carling Knockout final against Orlando Pirates.
Orlando Pirates face Marumo Gallants in the Carling Knockout Cup final at Peter Mokaba Stadium on Saturday as they attempt to win their second trophy this season.
Orlando Pirates captain Nkosinathi Sibisi is keeping his focus sharply on the Carling Knockout Cup title as his team tops the Betway Premiership table with 28 points after 12 games.
