This is an optional Exotek B6.3 Aluminum Laydown Idler Gear (39T).
Hard anodized 7075 alloy 39T idler gear for the B6.3 B6.2 etc laydown gear boxes.
Must have for high powered racing applications.
This is much stronger than the stock plastic idler gear but not indestructible so it is important to use black or white grease on the gears and reapply frequently to prolong its life along with proper slipper adjustments.
