*shrugs*
I was just looking at a tough build.
and assumed you'd want to.
personally, when I do my one, I'll be using rb30 bottom end with stock pistons and rods, stock nissan gaskets, stock RB25de head.
using some decent sized turbo, intercooler, oil cooler, ecu, I am looking at 250rwkw+ and that is my goal.
and I have been told many a times that the above combo will do it.
see mine is all cheap options..
But you already have a RB26dett head with decent turbo's on there.
I assumed you'd spend an extra $1200 odd for peace of mind.
Is it required??? I don't know..
gary would be better off answering that.