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So I am trying to digest this and from someone who has done most of this already you have me a bit confused.
The 993 and 964 ABS has no compatibility if it was originally 964 you will need to replace the tone rings and pickups I see since you already have 993 fronts I must assume if they changed to multi link the same goes for the rear.. I don't recall the exact count but I believe the 964 has 52 vs 54 teeth for the 993. Then you will need to plumb a line for the 993 four channel ABS vs the 964's 3 channel system. The 964 RS came with a 25.4mm MC and the C4 a 23.81 At least the one I removed from my 90 C4 was. Replacing with the larger 25.4MC requires adapters and the cost is crazy these days it was $500 a few years back they are over $1000 today.
You will need to rewire your existing harness and you can purchase the correct connectors to use with the 993 ABS unit but it will be work.
These projects are far more complicated than most can imagine.
GL
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Anthony PCA affiliate '77 member '83 '90 3.8 RS tribute, 91 C4 converted to C2,'93 964 C2, '93 928 GTS M '94 Turbo 3.6, '15 Boxster GTS M,16 GT4,23 Macan GTS,
Gone worth mentioning '71 E '79 SC, '79 built to '74 3.0 RS tribute (2390 # 270 hp), '80 928 euro 5 speed, '74 2.0l 914, '89 944 S2,'04 Cayenne TT '14 boxster, '14 Cayenne GTS 14 Cayman S, 18 Macan GTS many others
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