* Emissions: The catalytic converter is crucial for reducing harmful emissions. Without it, your car will spew significantly more pollutants into the atmosphere, leading to potential fines if caught.
* Engine Performance: While the engine might start and run, the lack of backpressure from the catalytic converter can cause problems. It can affect the air/fuel mixture, leading to reduced power, rough idling, and potentially damage to the engine over time. The oxygen sensors might also throw codes, triggering the check engine light.
* Legality: Driving a vehicle without a catalytic converter is illegal in most places. Inspection stations will fail your car, and you risk hefty fines or even vehicle impoundment.
In short, while it *might* run, it's not advisable to drive a Grand Prix GT (or any car) without a catalytic converter. It's bad for the environment, bad for your car's health, and against the law.
