the only thing power-shifting does is reapply power to the drivetrain with a lot more load and shock. Its not going to noticeably wear the transmission more because compared to a good normal quickshift, the RPMs are barely any higher, maybe a few hundred RPM. The extra shock doesnt seem to overwhelm it based on my experience.
Driveshaft is bullet proof, rear end is bullet proof. Ya the axles could break... but I think that is only going to happen if it was severely hurt by a launch and then let go during a shift. My stock 350z axles lasted about 50,000 of power shifting on the regular. My 370z is on original axles. Both cars only saw hard launches a couple times ever, as I do not generally go to the track, and nothing hooks up well enough on the street to even try and launch. Differential mounts and engine mounts are the most likely failure points. Assuming you arent missing shifts and grinding the hell out of the trans.
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