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#4: 03-01-2013, 01:36 AM
 Serb Legacy GT
Title: Senior Member
Location: Mount Prospect, IL
Car: '05 Legacy GT 5pd; 99 M3 cpe 5spd
Posts: 258
iTrader: (4)
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For 2005 and 2006 LGT's, there is no difference in short block with an STi motor from 2004-2006...even the pistons are the same. They share the same part number. My understanding is Subaru has changed the part number a few times over the past few years as revisions were done to the short block. The most current part number right now is 10103AC030. If you search that part number on a vendors site from this forum (infamous, heuberger, fred beans, boston motorsports, etc) you will see that it is the same part number for both an EJ255 and EJ257. You can also google Subaru parts, open a link into one of the results for OEM Subaru parts, punch in that number and get both EJ255 an EJ257 to come up.