No, a straight pipe for a catalytic converter delete is not referred to as a resonator pipe. These are two separate components that serve different purposes in the exhaust system of a car.

A catalytic converter is a part of the exhaust system that helps reduce harmful emissions by converting them into less harmful substances through a chemical reaction. It is essential for meeting emission standards and environmental regulations. However, some car enthusiasts choose to remove the catalytic converter to achieve better exhaust flow and potentially gain more horsepower. This is often referred to as a "cat delete" or a "straight pipe" because it involves removing the catalytic converter and replacing it with a straight section of pipe.

On the other hand, a resonator pipe is a component designed to reduce or eliminate certain frequencies of sound in the exhaust system. It helps to dampen or reduce exhaust noise and minimize any unwanted droning or resonance. Many modern cars come factory-equipped with resonators to provide a quieter and more pleasant exhaust note. However, some car enthusiasts may choose to remove or replace the resonator for a louder and more aggressive exhaust sound.

While both a catalytic converter delete and a resonator delete involve modifying the exhaust system, they serve different purposes. Removing the catalytic converter is typically done for performance reasons, while removing the resonator is typically done for sound enhancement purposes. It's essential to note that removing a catalytic converter is illegal in many places due to emissions regulations, and it may also cause the vehicle to fail emissions testing.