I have my saph 6years now...and i drove it everyday...and still do..
The engine itself is very reliable....it broke a headgasket do to wrong maintainance (spelling)...now its very reliable ever since..with late type escos headgasket and ARP headbolts...

Then one thing which broke very often is an ancilleryhose which goes from the head to the heatexchanger...where the hose turns 90 degree...at that place it opened and spells its coolant...

Some samco's solved the problem...

Since then its very reliable...

Oh...and it had 250K+km's...and stage 3..