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For a 1999 engine you'll need a 7.0 DME.
A 1997 986 will have a 5.1 DME - not compatible, because it hasn't the correct in- and outputs. Also the engine wiring harness is different.
If you get an 7.0 DME from a 986 the mapping needs to be flashed for a 996 3.4 engine. This can't be done by OBD. This always needs to be done on the bench.
Check what alarm control module you have. If you have a M531, you'll need to update to an M535. If you have a M535 it can be reprogrammed to work with the newer DME.
If you need to update from M531 to M535 the wiring harness has to be updated too.
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