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521 (3rd) / 1
EJ255/EJ257/EJ207 V10+/EJ20X/EJ20Y (DBW Throttle)
Spring selection is dependent on the desired boost control range of the wastegate
Legacy Spec B TY856 6MT
Main Shaft TY856 6MT 3.636 / 2.375 Ratio Stainless Steel Clutch Line 521 (3rd) / 1Main shaft (aka input shaft) for 6 speed manual transmissions with trans ID codes starting with "TY856". This is for standard ratio applications such as MY04 06 USDM STI and 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 resulting swarf.
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