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cecil_t
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I just unplugged the upper switch on the clutch and didn't really notice any difference on my 997. After a couple of miles driving I did get a check engine light with the message "drive-off assistance failure" or something like that. I guess that switch is used at least for that feature (it's the hill-hold feature when starting from a stop on an incline). I plugged the switch back in and the error went away and I did some more hard starts and hard shifts and didn't notice any appreciable difference in power. So if it is delaying the timing or changing the engine map to make less power after a shift on the 997 it's really subtle.