2004 - Early 2006 6-Speed Subaru STI
Rebuilding your STI’s transmission or experiencing gear grinding and rough shifts? IAG’s Carbon Synchro Set is engineered to enhance performance, improve shift quality, and extend transmission life for your 2004–2006 Subaru STI 6-speed.
Complete Synchro Set
Includes carbon synchros for 1st through 6th gear—no need to mix OEM and aftermarket parts.
Dual Carbon Friction Surfaces
Improves engagement, reduces wear on sleeves and gear teeth, and enables faster, smoother shifts.
Japanese Brass Construction
High-quality brass allows for precise machining and exceptional durability under aggressive driving.
Enhanced Surface Contact
Maximizes grip between synchro and gear for reduced shift times and improved driving experience.
Built for High-Performance Use
Perfect for spirited driving, track days, or performance builds that demand better-than-OEM reliability.
Reduces gear grinding under load
Extends synchro and gear life
Improves shift feel and engagement speed
Helps prevent long-term transmission housing damage
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