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Because the factory airbox on these models now incorporates a hydrocarbon trap (an emissions device)
These are installed into the cylinder head using RTV sealer around the perimeter
A dual spring setup offers increased fatigue life
EJ207 MY99-02
RESTORE YOUR ELECTRONIC CENTER DIFFERENTIAL
3rd/4th Driven Gear Cluster TY856 6MT Ratio 1.521/1.137 Woodruff Key:Narrow Because the factory airbox on3rd 4th driven gear for 6 speed manual transmissions with trans ID codes starting with "TY856". Early models use a wide keyway (10mm wide) and later models use a narrow keyway (7mm wide). This is used in our RST F145Kit (2nd 6th long ratio) gear sets. We offer an adapter keyway to use a later narrow key gear cluster in a wide key application (available separately on our site) when necessary. Optional REM ISF (superfinishing) treatment. ISF is a
