Will this bolt directly to my factory exhaust system?

Yes — it mounts at the factory attachment points on the left side. No welding, drilling, or adapters needed. Just unbolt the old unit and install the new one.

Does this come with a gasket or O2 sensor?

The converter assembly is included. Check your existing gaskets and sensors before installation — you may need to reuse or replace them depending on their condition.

What's the difference between federal and non-federal catalytic converters?

Federal converters meet U.S. EPA emissions standards and are street-legal nationwide. This unit is tuned for that standard, so it'll pass emissions testing and keep your Tundra compliant.