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What type of Link ECU do I have ?

Rob Kenney

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I have just come into a 1994 WRX sti,  I opened the ecu  case and found the link computer 

it reads on the back LINK 1996 SUBARU V3.3. 

On the front a sticker on chip reads WRXROAD 421  and another stocker reads 585

Could anyone please help me Identify this computer and what functions it has, also is it PClink tunable ?

Is it possible to upgrade the firmware ?  

Kind Regards 



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