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A 15 to 25% reduction in shift throw in each direction has been achieved while retaining the quality and fitment of the original shifter
a water pump gasket
CHARGING INTERCOOLER PERFORMANCE
32275AA630 (USDM STI MY19-21)
Manufacturer Part No: SUSMP21S2
4th Drive Gear TY856 6MT Ratio 1.346 Catalytic Converter A 15 to 25% reduction4th 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
