Why does the exhaust pipe sound muffled like a sports car?

[MatteoLynn]

Reasons why the exhaust pipe sounds muffled like a sports car are as follows: 1. Exhaust pipe leakage: When there is a leak in the intake pipe, as the vehicle speed increases, the exhaust speed also increases, causing the vehicle to emit a loud roar. 2. Throttle blockage: During vehicle acceleration, the engine load increases. At this time, it is necessary to increase the throttle opening and the amount of oil. If the throttle opening does not reach the optimal position due to blockage, the engine's air-fuel mixture ratio will be poor, resulting in noise during acceleration. 3. Engine misfire: Engine misfire mainly refers to the abnormal operation of one or more cylinders in the engine, generally manifested as insufficient vehicle power and severe vibration of the exhaust pipe, with the engine making a "puttering" or thumping roar.