12a to 13b twin turbo swap

[BoostedFC]

Well you have project ahead of you. First what is the car's purpose, what is your power goals, what is your budget & who will be doing the work? A S4 (1987-198 13BT or a S5 13BT (1989 - 1991) which are both single turbo & should provide a good platform to build on. The 13B-RE (1990-1995) from the 2 rotor Cosmo have the largest ports from the factory, the 13B-REW from the S6 up (1992-2002). The RE & REW are both twin turbo from the factory. When talking about power we would really know your goals, that way we can better direct you. Things like stand alone ECU, Turbo upgrade, fuel system & many other aspects will come to play. BTW there was a factory turbo 12A offered from 1982-1989 in the HB Cosmo or from 1984-1985 in the RX7. You could always spend the money build & turbo the motor you have now.