There is a motorsports type AOS available for the m96 engine as I have on fitted to my 987 3.2. It was never generally available and pretty much a development item. It differs from the 996 motorsports AOS in that it has a profile to suit the secondary air pump location specific to the boXster and later cayman. Details of installation and part numbers etc can be found in the tech articles section of planet-9.com
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