How thick is the pipe for the first generation Fit exhaust to enter the throttle?

1.6 cm. According to car home's inquiry, the first-generation Fit exhaust pipe entering the throttle valve is original fittings, which need to meet the original design specifications, with a diameter of1.6cm.. Throttle is a controllable valve that controls air to enter the engine. After the air enters the intake pipe, it will be mixed with gasoline to form a combustible mixture, and the combustion is successful. Connected with the air filter and the engine block, it is called the throat of the automobile engine.