i plan on getting a backup motor so why not the nicer one

its actually very different inside, off the top of my head, stronger pistons and variable valve timing on both intake and exhaust

my friend just bought a g35 but he shopped Zs first, and he said once you drive it, you understand how different it is, way more rev happy, more of a sports car motor.

It also has less TQ.

but more area under the curve

do you ahve a stock dyno of each by chance? that would be handy