It's always a good idea to at least get the A\F checked on the dyno. I've seen so many Zs and Gs run on the extreme side of lean after doing typical NA mods. The big one being intakes that use a larger MAF pipe.
You can see some AFR curves on our blog:
VQ37VHRs:
370ZG37 (Z34 & V36) | Specialty-Z
VQ35DEs:
350ZG35 (Z33 & V35) | Specialty-Z