the type of engine really doesnt matter as far as what series goes. most of the sensors will swap over.

however, it is a pain in the DICK to get an engine from japan because you know zero about its current condition.

anyways. an s5t2 engine by itseld, will need an s5 t2 afm, s5t2 pressure sensor, s5t2 intake manifolds. the injectors need to be cleaned. the fuel pump will need an upgrade. the s5 turbo is ok, but needs to be upgraded as far as the waste gate goes so you dont get boost creep. the ecu is shit. the omp is shit. the harness is shit. ditch those. get a stand alone ecu, some bigger injectors, and then your ok.

oh, and dont forget to get a throttle cable. those are different as well as the hood.

at this point go ahead and get a new clutch slave, and new ss clutch line. youll be glad that you did.

if the engine comes with a series 5 t2 tranny, get the mazdatrix driveshaft as you well know by now, and then it will bolt right up.

the exhaust is all pretty good and well and the stock catbacks are almost identical between a na and t2. just size and flow.