You could alway turbo charged the z22se
Or install a complete B207R or Z20LET engine - cheaper and seem to be more readily available than Z20LET's.. Lighter and same power capacity (before breaking), turbo / ancillaries dependant.. Bolts straight in too with existing engine NA mounts, gearbox etc. Just need to figure out wiring (OBD Tuner works or LSJ) and plumbing..