Standard Remote Control system includes a control box and 2 standard remote controls, which allows users to open/close the exhaust valves or set on Auto Mode. Auto Mode settings need to be applied manually to the control box.
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FI Exhaust 2017+ Audi S4/S5 (B9) Valvetronic Exhaust System
$3,750.00
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Audi B9 S4/S5 Fi Exhaust (Frequency Intelligent Exhaust) high-performance valvetronic exhaust system is direct replacement bolt on system manufactured out of a high-grade T304 stainless steel that offers an exhilarating soundtrack.
The Fi EXHAUST system is designed with a valvetronic technology to control airflow, sound volume and enhance the overall performance and torque. On average horsepower is expected to increase from 5-10% after installing a full catless system, which includes a valvetronic catback and ultra-high flow downpipe.
When valves are closed exhaust gasses are routed through the muffler resulting in a low-profile comfortable drive. However, when the valves are fully open an intense and sporty soundtrack is produced.
Switching between street and race sound profiles can be done using factory exhaust/sport button or drive mode, or optional Fi EXHAUST remote control and mobile App.
The unique sound and performance for Audi B9 S5 is achieved through individually designed muffler internals that are fabricated to offer an ultimate driving experience.
Please note each part of the Fi EXHAUST system needs to be ordered separately.
Different exhaust parts are offered depending on the vehicle version.
Please note that the actual product may vary in appearance depending on the year of the car and area. The exhaust system is also subject to changes to the design over an extended time period. Product pictures are for illustration purposes only.
Catback Exhaust:
Front Pipe + Mid X-Pipe + Valvetronic Muffler + Quad Silver Tips + Standard remote control system module (AD-S4B9-CBV + TIP6389S*4 + R2016OL + OBD-CAB-V)
Downpipes (Optional):
1.Ultra High Flow DownPipe (AD-S4B9-NCAT)
2.Sport 200 cell DownPipe (AD-S4B9-CAT200)
Tips (Optional):
1.Quad Tips in Titanium Blue (TIP6389TB*4)
2.Quad Tips in Diamond Black (TIP6389B*4)
3.Quad Tips in Gold (TIP6389G*4)
4.Quad Tips with Carbon Fiber (TIP6389C*4)
Fi EXHAUST Pro Remote Control System (Optional):
OBD2/Mobile APP Remote Control System Module (R2020OBD)
O P T I O N S and D E T A I L S
VALVES
All Fi-EXHAUST exhaust systems are equipped with valvetronic technology. This technology is not only used to control sound volume, but also enhance overall performance of the vehicle. Before the inception of this technology, horsepower and torque were irreconcilable contradictions in the design of exhaust systems. This allowed sports cars to have high torque power at low rev speeds and even higher horsepower capability at high rev speeds.
DOWNPIPES
Unleash the true potential of your car with our premium aftermarket downpipes. Engineered for maximum performance and durability, our downpipes are crafted from high-quality stainless steel to withstand the rigors of high-performance driving. Experience improved exhaust flow and turbocharger response, resulting in noticeable gains in horsepower and torque. Our downpipes are designed to replace restrictive factory components, allowing your engine to breathe more freely for enhanced performance. With easy bolt-on installation and precision engineering, our aftermarket downpipes ensure a perfect fit and optimal performance every time. Whether you're seeking an exhilarating driving experience on the track or improved responsiveness on the road, our downpipes are the perfect upgrade. Unlock the true potential of your ultimate driving machine.
Catless Standard Version
The ultra-high flow catless downpipes remove restrictive factory catalytic convertor. They increase exhaust gas flow and performance gains, produce higher sound volume. And is usually recommended option going further with ECU tuning.
Catless Sensor Version
The ultra-high flow catless downpipes remove restrictive factory catalytic convertor. They increase exhaust gas flow and performance gains, produce higher sound volume. The downpipe is also equipped with a dummy oxygen sensor to reduce a chance of the check engine light (CEL) being triggered.
Race 100Cell
This kind of catalyst is generally used in race cars , so it is often called “racing catalyst”. With the larger cells and fast exhaust flow rate, it is smooth, durable and do not have refractory wool burn-out problems. The higher the number of the cells, the smaller and denser the hole is. The higher the back pressure, the more it can enhance torque performance, while the opposite is true for increasing horsepower. Converting your stock catalyst converter (400~800 CPSI) into our metallic catalyst converters will result in significant enhancements in airflow discharge that circumvents the limitations and parameters set by car manufacturers.
Sport 200Cell
With the larger cells and fast exhaust flow rate, it is smooth, durable and do not have refractory wool burn-out problems. The higher the number of the cells, the smaller and denser the hole is. The higher the back pressure, the more it can enhance torque performance, while the opposite is true for increasing horsepower.Converting your stock catalyst converter (400~800 CPSI) into our metallic catalyst converters will result in significant enhancements in airflow discharge that circumvents the limitations and parameters set by car manufacturers
HEAT PROTECTION
Ceramic Coating
Fi-EXHAUST eliminates traditional thermal insulation materials that contain toxic substances, and directly coats the exhaust pipe with a nano-ceramic coating to protect from corrosion, reduce heat exposure to heat sensitive components in the engine bay and keeps temperature low. It’s a great way to improve longevity of the exhaust and other components prone to thermal degradation like wiring.
REMOTE CONTROL
What are the benefits of upgrading the exhaust remote control to FI Pro Control System:
Fi EXHAUST Pro Control System upgrade version includes a new generation of control box, mobile phone APP 2.0 Pro version and a two-button style remote control.
- Monitor real-time valve status with Fi EXHAUST Pro App’s intuitive and friendly interface.
- Fi EXHAUST Pro App automatically scans and erases annoying CEL related to catalytic convertor.
- Customize what 2 buttons on the physical remote control do. Manually open/close valves or activate Auto Mode.
- Fast pairing and connection with Fi EXHAUST Pro Bluetooth.
- Pair multiple remote controls to Fi EXHAUST Pro App.
- Intelligent Fi EXHAUST Pro Version control box can be used with Fi EXHAUST vacuum valve system and OEM electric valves for Mercedes-Benz, BMW and Audi models.
Fi-EXHAUST PRO CONTROL SYSTEM
Fi-EXHAUST Pro Control System control system consist of intelligent control box, sporty 2 button style remote control and mobile App.
*The mobile App scans and deletes CEL using manual or Auto scan on the engine startup.
* Monitor real-time valve status with Fi-EXHAUST Pro App’s intuitive and friendly interface.
* Assign Auto Mode data values. Afterwards the system will intelligently detect engine RPM/Speed/Turbo Boost and turn on the valves.
* Each remote control button can be assigned with 1 function to open/close the valves or activate Auto Mode delivering more precision in the hands of the driver.
* The design is smooth and offers a nice grip, and the aluminum alloy ring can be customized in 14 different colors or switched to forged carbon with a unique marble like texture.
After a year of development Fi-EXHAUST team is proud to present the new and improved Fi-EXHAUST Pro version control box, mobile App and redesigned remote control. The App intelligently remembers your settings, automatically connects to the Fi-EXHAUST Pro Version control box after first time pairing and interactive interface design is joy to use. Every time the App launches it’s like a pleasant conversation between Fi-EXHAUST and your car.
Fi-EXHAUST Pro offers 6 features:
- Monitors real-time valve status with Fi-EXHAUST Pro App’s intuitive and friendly interface. Mount your phone on a dashboard and use Fi Pro as a second digital display.
- On an engine startup Fi-EXHAUST Pro App automatically scans and erases annoying CEL related to catalytic convertor for selected car models.
- Experience more intuitive way how to control exhaust valves. Customize what 2 buttons on the physical remote control do. Manually open/close the exhaust valves or activate Auto Mode.
- Fast pairing and connection with Fi-EXHAUST Pro Bluetooth delivers a smoother experience.
- Pair multiple remote controls to Fi-EXHAUST Pro. You can use the same Fi Pro remote control to awaken Fi symphony on multiple cars installed with Fi-EXHAUST system. Free up pocket space and carry only a single remote. Please note that this only if you have Fi-EXHAUST Pro installed on your cars.
- Intelligent Fi-EXHAUST Pro Version control box can be used with Fi-EXHAUST vacuum valve system and OEM electric valves for Mercedes-Benz, BMW and Audi models.
Both Standard and Fi PRO control system utilize OBD connection.The standard remote provides the 3 basic functions, including OPEN, CLOSE, and Auto valving (open automatically base on throttle, rpm, or boost level). To enable the Auto valving feature, the OBDII port must be connected.
The Fi PRO control/upgrade option has a different key fob. The main features are available on the Fi PRO app. They allow the driver to control the valves and do all the valve setting directly on a mobile phone. Without the OBD connected, only the basic ON/OFF function will be functional. The Auto valving, or cold start valve position (Fi PRO feature), will only be activated when the OBD is connected.
Does the standard remote option include the OBD dongle, handheld remotes, and an electrically control vacuum module to actuate the valves on the Fi mufflers?
Both Standard and Fi PRO control kit include OBD dongle, as both kits have the Auto valving feature that’s required to connect with the OBD port to read live data from the ECU. The control kit will include a module box to send signal to soleniod to allow the vacuum to pass to the flaps or not and to turn the valves on and off.
Your Second Digital Display
Smart and intuitive interface instantly shows valve status
Automatically Deletes CEL
Fi EXHAUST Pro App automatically detects and erases annoying check engine error codes related to catalytic convertor
Pair Multiple Remote Controls
No matter what car or Fi Pro Version remote control you’re using, you can always connect to a Bluetooth control box and control valves
DELIVERY
If your product is out of stock, it will take two to three weeks for production and quality control packaging.
If the exhaust is in stock, it is shipped typically within 2-3 business days.
Shipping: It usually takes 3-5 days for DHL international courier to deliver the package. Please note that the delivery time might be extended if the the package is stopped at the customs.
MODIFICATION GUIDE
Dear car enthusiasts, today we'll delve into the latest trends in modifying exhaust systems in 2024, specifically tailored for those interested in enhancing the performance of supercars and high-performance sedans.
In this era of rapid development in the automotive industry, the rise of electric vehicles and increasingly stringent emission regulations are reshaping our driving experiences. With the widespread adoption of Otto/Gasoline Particulate Filters (OPF/GPF) and strict global enforcement against noise pollution, exhaust valvetronic technology is becoming increasingly crucial.
Adapting to Noise Regulations – Save Your Wallet
In 2023, Taiwan implemented noise technology enforcement in 21 cities and counties, issuing over 5000 fines. For instance, in the United States, New York recently passed the "Stop Spreading the Noise" act, equipping sound-sensitive cameras to capture noise exceeding 85 decibels, presenting a new challenge for modified car owners.
Here, Fi EXHAUST's Valvetronic technology becomes the key solution to this challenge. This technology allows car owners to seamlessly switch between street and track sound configurations with a simple button press. When the valve is closed, exhaust gases pass through a muffler, creating a discreet and comfortable driving experience. When the valve is fully open, it generates a distinctive, pulsating engine roar for an exhilarating experience.
For example, the Mercedes-Benz C118 CLA250, our Fi valvetronic performance exhaust system averages a 75-decibel sound. However, when the valve is open, owners can enjoy more dynamic tones and driving pleasure. Whether the db reading abides the regulations will depend on the car models and exhaust setup installed on the car. Please contact our representative to get more details about your car.
This technology empowers car owners with the ability to control vehicle noise output, easily adapting to different environments and regulations. Imagine driving your modified car through the bustling streets of New York, smoothly transitioning from refined street sounds to more aggressive tones allowed by the road conditions. Fi EXHAUST's valvetronic system not only ensures compliance with noise regulations but also enhances the driving experience by providing customizable soundtracks.
Factory-Equipped OPF (GPF) – The Sound Suppressor
Next, let's talk about the widespread adoption of OPF (Particulate Filter) in new cars. As vehicle emission control becomes increasingly crucial, this poses another challenge for us enthusiasts, as OPF is commonly referred to as a sound suppressor. Apart from muting the exhaust sound, it also reduces exhaust efficiency. Therefore, many people, when discussing new cars, opt for the removal of the OPF, thinking that cutting it off would eliminate the need to replace the entire exhaust system.
It's important to remind car enthusiasts that this type of removal procedure typically doesn't involve disassembling the entire exhaust system. Instead, it entails lifting the chassis and performing the cutting and welding process. However, this approach increases the likelihood of welding defects. If the welds are not done properly, it may result in leaks or fractures, leading to more significant issues.
Fi EXHAUST utilizes CAD technology to ensure that each exhaust system achieves optimal fluid dynamics and enhances the quality of the exhaust pipe. By employing automatic bending and 3D cutting techniques, we aim to minimize the proportion of seams. Additionally, the entire section undergoes manual TIG welding to ensure a smoother and more durable exhaust system.
Counterfeit Exhaust Systems on the Rise
A crucial reminder for car enthusiasts looking to modify their vehicles in 2024 is the proliferation of counterfeit products. Regardless of the brand, the aftermarket industry has observed this alarming trend, where counterfeit products not only exhibit poor quality but also pose potential threats to your driving safety. Therefore, learning how to distinguish genuine from fake becomes paramount.
Here are a few tips for identifying the authenticity of Fi exhaust systems:
- Understand the product components: Fi's exhaust system consists of the downpipe and mid-section (including exhaust tips). Understanding these components aids in recognizing the integrity of the product.
- Certification nameplate: Whether it's the downpipe or catback-section, Fi EXHAUST products feature a nameplate detailing the car model and serial number. If the nameplate is missing or unclear, exercise caution.
- Purchase from authorized channels: Only buy and install exhaust systems through Fi-certified modification workshops and dealerships. You can check Fi's official website for information on DEALER, ensuring you purchase genuine products and enjoy comprehensive warranty services.
- Follow official announcement: Follow Fi EXHAUST's official fan page on all socials to stay updated on the latest modification knowledge and product information.
By employing these methods, you can effectively avoid purchasing counterfeit products, ensuring that your modifications are both safe and reliable. Remember, modification is not just a means to enhance vehicle performance; it is also an expression of personality and taste. In the world of modifications, let's collectively pursue excellence and savor the thrill that modifications bring!
Lastly, let's heed the words of Fi's Director, Alan: "Modification is not only about enhancing performance but also about giving vehicles a soul." In an era constrained by regulations, modifying exhaust systems has become the key to infusing real life into performance cars.
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German Muscle takes “customer service” very personally. Let us make this experience simple, easy, and awesome, feel free to email us at sales@germanmuscle.co.
| Car Model and Engine | All, B9, RS4 (Audi), S4 (Audi), S5 (Audi) |
|---|---|
| Make | Audi |
| Select Year | 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 |
| System | Exhaust, Valvetronic |
Brand
FI Exhaust
Learn more about Fi-Exhaust - Click Here
Frequency Intelligent Exhaust aka Fi EXHAUST is the world's first-rate aftermarket automotive exhaust brand which specializes in exhausts for supercars, sports cars, and high-performance vehicles for marques such as Lamborghini, Ferrari, McLaren, Porsche, Mercedes-AMG, BMW M, Audi, Nissan, and others.
From the outset, Fi R&D team has consistently engineered high-quality exhaust systems for car enthusiasts, who pursue superior sound and performance and require an exhaust system that will perform in all conditions. That’s why Fi EXHAUST products are made to produce maximum optimized performance. Fi produces a beautiful tone from deep bass to an exotic high-pitched Formula One racing sound depending on a car model's requirements. And to achieve this optimized state every exhaust system is carefully sound-tuned and undergoes rigorous testing to a specific frequency with our intelligent control system.
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