Saturday night's meeting between the two arch rivals will be the 17th time a Celtic Rugby fixture has attracted a 20,000+ gate.
Amazingly, 14 of those games have involved Munster and all bar three of them have been played in Ireland.
Here is the list of the Magners League's biggest gates ahead of Saturday night's massive match up.
31/12/2006 48,000 Leinster 20, Ulster 12 (Lansdowne Road)
01/02/2003 30,076 Munster 37, Neath 17 (Millennium Stadium *)
15/12/2001 30,000 Leinster 24, Munster 20 (Lansdowne Road *)
06/10/2006 27,252 Leinster 27, Munster 20 (Lansdowne Road)
15/05/2009 26,043 Munster 19, Ospreys 13 (Thomond Park)
18/04/2009 26,043 Munster 25, Connacht 10 (Thomond Park)
04/04/2009 26,043 Munster 22, Leinster 5 (Thomond Park)
02/04/2010 25,623 Munster 15, Leinster 16 (Thomond Park)
03/01/2009 25,623 Munster 11, Ulster 37 (Thomond Park)
26/12/2009 25,291 Munster 35, Connacht 3 (Thomond Park)
26/03/2010 23,814 Munster 27, Glasgow 19 (Thomond Park)
24/04/2010 23,754 Munster 11, Ospreys 15 (Thomond Park)
31/10/2009 23,298 Munster 24, Ulster 10 (Thomond Park)
04/10/2008 22,885 Munster 25, Glasgow 17 (Thomond Park)
27/12/2008 20,520 Ospreys 20, Scarlets 6 (Liberty Stadium)
26/12/2006 20,520 Ospreys 50, Scarlets 24 (Liberty Stadium)
*Celtic Cup Finals
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