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Just read the owners manual and the Camaro rev matches in both up shifts and downshifts. Every other manufacturer matches only on downshifts. The reason we are getting two blips, the first one putting the clutch in is that it is anticipating an up shift, and is just keeping the revs form dropping any lower than they would be once you select the next highest gear. It has to do this once the clutch is pressed, as up shifts are quick and it has to be ready, or it will be caught out by you.
The second blip comes when the lever is gated into lower gear, now the system knows you are going for a downshift so it blips the rpm to match engine speed once clutch is released.
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