nope, there are quite a few VXs bought new that have only ever been driven in power mode, all it does is allow you to rev a little higher before the transmission will shift, shouldnt cause any damage unless he was constantly redlining.. in which case power mode is the least of your worries..
personally i use power mode when ill be doing highway driving, but for around town i dont like having it on, makes my transmission feel sorta loose at low speeds
heres a discussion about it..
http://www.vehicross.info/forums/showthread.php?t=10023
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