What are the effects of water accumulation in the exhaust pipe?

[StWillow]

Water accumulation in the exhaust pipe has the following effects: 1. Engine water ingress: Water entering the exhaust pipe can lead to serious consequences of water ingress into the engine. If only the exhaust pipe has water, the accumulated water should be removed as soon as possible to prevent impurities in the water from clogging the three-way catalytic converter or damaging the oxygen sensor. To drain the water, simply increase the throttle to expel the water through the exhaust. 2. Engine stalling: Water in the exhaust pipe may cause exhaust blockage, leading to poor exhaust flow and engine stalling. However, in this case, the engine may not necessarily have water ingress; it's just commonly referred to as being "choked out." This situation does not require concern, as the engine can be restarted once the water has drained out.