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EJ255 (Legacy GT/Outback XT MY05-09)
32275AA630 (USDM STI MY19-21)
Two variations are available depending on the application
CHARGING INTERCOOLER PERFORMANCE
4th Drive Gear TY856 6MT Ratio 1.346 Catalytic Converter EJ255 (Legacy GT/Outback XT MY05-09)4th drive gear for 6 speed manual transmissions with trans ID codes starting with "TY856". This is the shorter gear ratio of the two available options and was used on USDM STI MY04 06 and all JDM STI. Optional REM ISF (superfinishing) treatment. ISF is a precisely controlled treatment that reduces surface roughness left from the machining processes thereby improving reliability, reducing friction, and all but eliminating break in requirements and the
