Forceful driving and aggressive shifting can wear down or harm synchros, potentially resulting in gear grinding or even damage to the transmission housing. The IAG Carbon Synchro Set is a great solution and an essential upgrade if you are rebuilding or upgrading the gearing in your Late 2006-2007 STI or 2007-2009 Legacy GT Spec B transmission. IAG’s Synchro Gear Set will give you smoother shifting and improved reliability.

IAG's Subaru STI 6 Speed Carbon Synchro Set features dual carbon friction surfaces, extending the life of both the synchro sleeve and gear teeth, while also allowing for faster and more precise shifting. The IAG Synchros are made from Japanese brass, which is known for its durability and ability to be intricately machined. Our Carbon Synchro Set is precision machined, resulting in an improved shift feel and reduced wear between moving components.

The IAG Carbon Synchro Set is designed to have increased surface contact between the gears and the synchros. This allows for quicker gear engagement, which decreases shift times. The increased surface contact also provides a better driving experience by using less effort to change gears.

IAG's Carbon Synchro Gear Set is sold as a complete kit, with all carbon synchros included. This Synchro Set includes the first, second, third, fourth, fifth and sixth gear carbon synchros. No need to hunt for missing synchros or seek out rare OEM parts, the IAG Carbon Synchro Set contains everything you need to upgrade the synchros in your Late 2006-2007 Subaru STI or 2007-2009 Legacy GT Spec B transmission.