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20B 3 rotors are common swaps. Not cheap, but vary doable. With that said a 13BT 2 rotor will support more then enough power to keep things interesting. Deciding what the car will be used for should be the first step along with knowing your budget. Around 350hp is a good level in a street RX7 & fairly easy to reach.
Here's a start to a fun driveable car, but there are other ways of getting there:
13BT with a small port job
BNR upgraded stock turbo
Front mount IC
Some sort of engine management
Some fuel system mods
After market clutch to hold the added power
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