If the tailpipe becomes blocked, pressure can build inside the exhaust system. This may cause the engine to run poorly, stall, backfire, or in some cases refuse to start until the obstruction is removed.
A blockage that becomes lodged deeper in the system could potentially damage components such as the muffler or catalytic converter. Repairs to these parts can be expensive, making this type of prank far less harmless than it first appears.
The safest approach is simple: never place objects inside a vehicle’s exhaust pipe. If you suspect the tailpipe has been blocked, avoid driving the car until the obstruction has been safely removed and the exhaust system checked if necessary.
