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I don't think you want to move the front rotors to the rear, if you want to do a brake upgrade, look into going for the SC400 rotors + calipers all around. Or you could do TT brakes up front and SC4 in the back. Be aware that with any TT brake upgrade, you are going to need wheels that have High Disk Fitment to clear Big Brakes, with the SC4 rotors this wouldn't be needed, but they are still stronger than SC3 brakes.
Another feasible brake upgrade is to go with LS400 rotors and calipers, this route will likely be cheaper than a TT brake upgrade and hence not quite as good, but much much better than the SC4 brakes. A sort of middle ground if you will. But again with the LS4 brakes, you are going to need wheels with High Disk Fitment.
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