Which is stronger? FRP (fiber-reinforced plastic) or advanced ceramics?
Water wont clog your exhaust, if water is in your exhaust just start the car it will blow out in a min or two. My truck gets water in the exhaust everytime I launch my boat.
Ceramics are way way stronger, BUT are limited in geometry. I can get a bathtub built out of FRP, but it would be very very difficult and very very very expensive to built an advanced ceramic bathtub. They are generally used for different types of applications.
water will shoot out as soon as the car is started. The rest will evaporate as exhaust pipe is extremely hot. Who told you that you had it in there and that the motor will blow?
Sounds like you had it parked in a flooded area,in order to get water in your exhaust system.If so,water could have seeped into the oil pan or trans.That might be a bigger problem.Drain and change oil and fluid if there is any doubt.As other writer stated,exhaust will blow water out when engine is started.