wrxmad

hi guys an girls please help... i have a 1993 wrx import
240bhp with mods about 260-270. can i upgrade the ecu 4 more power..or
will it just go bang ive looked at the superchips abc piggyback
but i think it will only work with uk spec... is this true??i have been told maybe by swapping ecu might up the horse power or what about manual boost controllers r they any good or will it blow the engine
what would you do????? z4 ecu ? 7d? oh! i have a u8 ecu at the moment...
help please