These firewall patches are for evo 8/9 owners who are turning their cars into racecars and are eliminating HVAC and heating components.
The large patches cover the hole where the HVAC components go through the firewall.
The small patches cover the hole where the heater core lines go through the firewall.
Patches are made from CNC laser cut 6061 aluminum. To install, set one patch on both sides of the firewall, align the holes in the patches and secure them together with the provided rivets.
If for any reason the patches need to be removed, simply drill out the rivets and the patches come right off!