You can run an ST170 4-2-1 manifold and exhaust system, use an ST170 air box and remove the resonator with a K&N panel filter, fit an Auto air deflector then your just about at the limit of what can be swapped under the bonnet. The ST170 runs a Blackoak ECU which is unique to the ST170 as is the Wiring, to switch to ST170 engine you need basically most of the ST170, engine, engine and car loom, ecu, keys, fuel pump, tank sender lines the lot. Not a 5 min job
The only similar item between the ESP and ST170 is the suspension