Z31s are slow...heads flow nothing... even modded they're slow the vg30et is NOTHING compared to the vg30DETT ... COMPLETE different motors...

z31's FTL,

Honestly i'd have my money on a sohc vtec honda vs a z31, they're too heavy and underpowered...

a modded turbo z31 (with boltons) would still get taken by your average built vtec na/ b series...