FI Exhaust Valvetronic Cat-Back System For Audi S4 / S5 (B9) 2018-2024
SKU: 76424379621

FI Exhaust Valvetronic Cat-Back System For Audi S4 / S5 (B9) 2018-2024

$1687.50 $1875.00
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Description

FI Exhaust Valvetronic Cat-Back System For Audi S4 / S5 (B9) 2018-2024Audi B9 S4 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

Audi B9 S4 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.

Depending on your car model and exhaust setup, switching exhaust valves between street and race modes may be achieved using a factory exhaust/sport button, drive modes, or by selecting the Fi Pro remote control upgrade. Please note that not all options are available for every model. Refer to the available section and contact our representative for confirmation.

The unique sound and performance for Audi B9 S4 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)

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 76424379621

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4.4 ★★★★★
Based on 122 reviews
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Product Reviews
A
Verified Purchase
Al
Phoenix, US
★★★★★ 5
Smooth Operation
Color: Brushed Aluminum, Style: No Light Kit
This Fan has exceptional airflow and operates smoothly. I use the included remote control. It took a little white to install and it’s fairly heavy, but besides that, it’s great.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 30, 2022
J
Verified Purchase
Jess
Birmingham, US
★★★★★ 5
Great for kids!
Color: White
I bought this stylus for the kids to use with their iPads, and it definitely gets the job done. It connects easily, charges fast, and works smoothly for drawing, writing, and playing around on apps. The palm rejection is a big plus—it makes it a lot easier for them to use without messing up what they’re doing. It’s also pretty responsive, which I wasn’t necessarily expecting at this price. Overall, it served its purpose well. If you’re looking for something affordable and functional for kids (or even light everyday use), this is a solid option.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2026
T
Verified Purchase
Thomas
Bozeman, US
★★★★★ 5
Rock-Solid Apple Pencil Replacement for iPad Mini
Color: White
Despite the box arriving pretty beat up inside the Amazon packaging, the pen itself was in perfect condition and it’s been outstanding. It works flawlessly with my iPad Mini (Gen 7, A17). The physical on/off button is a standout feature for me; the tactile click is far more satisfying and reliable than the touch-sensitive controls found on other pens. I primarily use this stylus while flying, taking notes in the air, and it performs exactly how I need it to. The magnetic attachment is especially impressive because it’s strong enough to add real security inside my iPad case. Even in rough air, I don’t have to worry about it getting knocked loose. I previously used a pencil from another brand that worked fine overall, but the weak (or nonexistent) magnetic hold was a dealbreaker. This one solves that problem completely and when it came time to buying a new pencil because I lost the old one, this was my choice. If you’re looking for a dependable, well-built Apple Pencil replacement with a solid magnetic connection and a satisfying physical control, this is an easy recommendation. You also CANNOT go wrong with the price!
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Reviewed in the United States on May 2, 2026
D
Verified Purchase
DLE
Fort Morgan, US
★★★★★ 5
Perfect stylus for my iPad.
Color: White
This stylus works great! It was easy to set up, and is perfect for my needs. The pen is the perfect weight and seems to be made of good material. I anticipate it will last a long time. The pen came charged and I still haven’t charged it. If you like using a stylus on an iPad, this one feels just like using a pencil. I like to write, so this has been a great choice.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 9, 2026
T
Verified Purchase
Taylor
Cuba, US
★★★★★ 5
Great product!
Color: White
I have now purchased two of these (I lost the first one) and they are absolutely a worthwhile purchase. Nicely packaged, easy set up, works great! Battery life is great and the pencil charged fairly quickly as well. Size of the pencil is wonderful, easy to hold and grip. Quality is great as well. 5 stars from me, hopefully I don’t lose this one! 🤣
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 7, 2026

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