What graphite shafts are the stiffest?

[golfstick]

Sort of following on from a previous thread but a slightly different topic. I have project x 6.5 shafts in my irons. what shaft would you look for in your driver that is of the same stiffness, if you know what i mean cos i regular stiff shaft just wont cut it

 

[fundy]

Hi golfstick

Use 6.5 flighted project x shafts in my irons, have Extra Stiff in my woods, A Fukijura Speeder in my driver, an Aldila NV in the 3 wood and Diamana in the hybrids.

But at this speed swing you really need to get them custom fit.