I once looked into this. Rear brakes are the same for all. The 'is models have larger front rotors, pads, and calipers. You'll need all of it if you decide to go OE. Stainless steel brake lines might help you too (though not OE). You'll also have to do a brake flush. Entire job will probably run almost a grand if you go all OE and have dealer do the flush.
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