How many catalytic converters would a vehicle with a "Y-pipe" likely have in its exhaust system?

A vehicle with a "Y-pipe" typically has one catalytic converter in its exhaust system. The "Y-pipe" configuration usually indicates that the exhaust system merges from two exhaust pipes into one, which is common in vehicles with a dual exhaust setup. In such systems, the exhaust gases from both sides of the engine combine into a single path, which generally leads to a single catalytic converter.

Having a single catalytic converter allows for effective conversion of harmful emissions for the combined exhaust flow. While some vehicles with dual exhaust may have multiple catalytic converters, they would not use a "Y-pipe" configuration leading to a single converter. Therefore, in the context of your specific question, it's accurate to conclude that the vehicle is likely designed with one catalytic converter.