Mark Wederall: Canterbury Car Club General Manager on this weekend's Supercars event in Ruapuna

All systems are go at Ruapuna ahead of the maiden South Island Supercars event.  The programme has a fourth race added after a postponement due to weather last week in Taupo.  More than 20,000 attendees are expected each day.  Canterbury Car Club GM Mark Wederall told Mike Hosking in…