Using the factory hole in the firewall for the engine harness this adapter allows you to install a aerospace 61 way bulkhead connector (not included). Allows clearance for a 90* heat shrink boot on both sides, ample clearance around the blower fan and heater core.

These are uncoated aluminum but can be anodized upon request and additional cost. 

Check out our instagram post for a video of how it assembles 

Note these have been test fitted in S13's only so far. S14/15 use the same size grommet but I cannot guarantee the firewall thickness is the same.