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Max Boost = 40psi/50psi
The combined springs offer a high closing pressure while increasing the opening range before coil bind vs
Tuning required when using this product
: 14421AA091
2nd Driven Gear TY856 6MT Ratio 2.375 Intake Max Boost = 40psi/50psi2nd driven gear for 6 speed manual transmissions with trans ID codes starting with "TY856". This is the shorter ratio 2nd gear used in 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 resulting swarf. Ideally, we
