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The curved channel is for the air injection system. The same gasket is used on 987's. Maybe they enlarged the ports to use it with 987.2 also? I used a set on my '98 986 a couple months ago and didn't notice the change. I haven't had any problems with them, but I am not sure they are the larger size. Mine were aftermarket Victor Reinz parts (oem mfg) rather than the porsche badged ones.
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