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if i'm not mistaken,the diff between wrx and sti..sti is uprgraded than wrx..include computer box,piston,brake system,turbo and all those kind of setting tuned by subaru technica's team..more horsepower and torque rather than wrx..it is same goes like honda's car..where it have type R version..version 1-5 i don't know much..but version 6-9 have both wrx and sti..usually some wrx have 2 door coupe because it come from australia specs or europe specs..japan specs mostly come with 4 doors..version 7-9 i don't know whether they have coupe or not..
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