I have power shifted just about every stick car i've ever driven at some point. I have never broken a trans. As for the stock T5, I even borrowed a 100K+ trans with no reverse (I was trying to figure out if a driveline vibration was the trans) & 5k launched & power shifted all night (like 8 passes) 1.5* 60ft & all runs mid 11's spraying the 4hit out of & couldn't break it.
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