The donor has two oxygen sensors and there is not a sensor byng on the exhaust manifold. On a NA build using the stock donor manifold, the upstream sensor will be installed in the kit-supplied exhaust and the downstream sensor is unused.
If you use something aftermarket, like the ZZP shorty header, with the kit-supplied exhaust, then you'll have two bungs (one in the header collector and one in the kit-supplied exhaust). The downstream sensor still is not required for monitoring catalytic converter operation, but may be installed in the downstream position as a plug for the hole.