Does modifying an Audi A4 with an S4 exhaust affect power?

[Claudia]

Audi A4 modified with an S4 exhaust will affect power. The main goal of exhaust pipe modification is to enhance power performance. Unauthorized changes to vehicle parameters constitute illegal modification: Modifications such as altering vehicle tires and rims, adding spoilers, lights, exhaust pipes, etc., are all considered illegal modifications. These must be restored to their original condition to pass inspection, and penalties such as fines and license suspension may also be imposed. Legal basis: According to Article 97 of the "Road Traffic Safety Law of the People's Republic of China": No unit or individual may assemble a motor vehicle or alter the registered structure, construction, or characteristics of a motor vehicle without authorization.

[McCorey]

I've seen many car enthusiasts modify their exhaust systems. As for swapping an A4 exhaust for an S4 one, the impact on performance requires specific analysis. The S4 pipes are larger in size, allowing for smoother exhaust flow, which might slightly increase horsepower at high RPMs, making acceleration more exhilarating on the highway. However, the A4's engine has less power, and if not properly matched, it could lose low-end torque, making the car feel sluggish at start-up and even increase fuel consumption. The sound will definitely get louder—cool as the roar may be, it can be too noisy for city driving and might attract unwanted attention from traffic police. Installation quality is also crucial; poor workmanship or inferior materials can lead to exhaust leaks, reducing performance and potentially damaging the engine. Before making any modifications, it's advisable to check the factory specifications and have a professional shop test the compatibility—don't cut corners just to save money.

[Aliyah]

As a regular car owner, I've installed similar aftermarket parts on my A4 and felt a slight power increase in the high RPM range, with a stronger push-back sensation, maybe gaining a few extra horsepower. However, throttle response became sluggish at low RPMs, making it frustrating to drive in traffic and less smooth overall. The noise was extremely loud—my wife complained about going deaf, and even the neighbors protested. Once, during an inspection, the car failed the emissions test, costing a fortune to fix, and I also discovered unstable power output. In summary, modifying the exhaust offers minimal power gains but comes with greater risks and hassles. It's not worth modifying just for show; sticking with the original setup is more worry-free.

[SanReese]

Exhaust modifications mainly affect power through compatibility. Installing an S4 exhaust on an A4 may slightly increase horsepower due to smoother exhaust flow, especially during rapid acceleration. However, larger pipe diameters can cause low-end torque loss, weaker starts, and increased engine stress. Poor modifications may also impact fuel consumption and noise levels, potentially exceeding legal limits. Professional installation is crucial; otherwise, power may decrease rather than increase. It's advisable to think twice before making impulsive modifications.