not all sti's are 2 doors

some are 4..

there is also STI RA varients which are 4 doors..

as for confirming if its an sti, there are a number of differences in what parts are attached, but, best way would be get the vin number and see if you can get a subaru to match up what it would be, as they usually do varients withing specific ranges of numbers...

that said in NZ, chances are they are all STI's as they don't have stupid import laws preventing them coming in

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