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To my understanding vario plus means the valve lift is continously variable which is present on 2003 and newer boxsters. Pre- 03 boxsters used a selonoid that worked more like an on off switch. 03+ cars used a infinately variable "stator" that varied valve lift up to 45 degrees I belive. Jim AKA MN boxster knows more on this than I maybe he could tell you. I would imagine the new hp increase is due to better breathing and ECU changes for the 2007 2.7L boxster.
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