I disconnected the TBs and moved the butterflies on three different Z's in one day a couple years ago without issue. Just make sure you do the pedal position reset. See posts 41-43 in this thread for clarification.
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2011 370Z 6MT Sport Gun Metallic | ARC | CJM | Ecutek | FI | Fujimura | R2C | SPL | Stillen | TWM | Z1 | ZSpeed | |