Why Do Some Replacement Exhaust Manifolds Come With Catalytic Converters?

2015 Honda Pilot Catalytic Converter Bank 1

Why do some replacement exhaust manifolds come with catalytic converters? Catalytic converters placement manifolds

Converter catalytic civic honda exhaust system pipe where diy install header Diy how to install a honda catalytic converter & exhaust system (pt. 2

DIY How to Install a Honda Catalytic Converter & Exhaust System (pt. 2

Why Do Some Replacement Exhaust Manifolds Come With Catalytic Converters?
Why Do Some Replacement Exhaust Manifolds Come With Catalytic Converters?

DIY How to Install a Honda Catalytic Converter & Exhaust System (pt. 2
DIY How to Install a Honda Catalytic Converter & Exhaust System (pt. 2