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

Sale price$1687.50 Regular price$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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Rita
Alexandria, US
★★★★★ 5
Really nice first book set for little hands
Format: Hardcover, Format: Hardcover
This is such a great little book set! The books are small, have sturdy hard pages, and are super easy for little hands to flip through. My baby is 11 months old, and these are honestly perfect for this stage, they’re simple, engaging, and just the right size for early learning. I really like that each book has its own theme (like wild animals, transport, shapes, etc.). It keeps things interesting and helps introduce new words in a fun and easy way. Another big plus for me is that the pictures are photo-realistic, which I think is really important when babies are learning about the world, they can actually connect what they see in the book to real life. The quality of the set is excellent, the images are bright, colorful, and crisp, and the books feel durable enough to handle lots of use (and chewing, let’s be honest). I also love the sturdy box it comes in, it keeps everything organized and makes cleanup easy. Overall, such a nice little library to read and enjoy with your baby. Definitely recommend!
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Reviewed in the United States on April 21, 2026
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Overture234
Louisville, US
★★★★★ 5
Perfect Purchase
Format: Hardcover
Wonderful. Perfect size for little hands. Colorful. Caught my grandson’s attention as soon as my son unwrapped it. A good number of choices, so it’s easy to keep my grandson’s attention for over. 1/2 hour. I’d say that’s terrific for a little guy. All in all, this is the best set of books I’ve bought. Money well spent! He’ll probably wear them out before a little brother or sister comes along 😂
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Reviewed in the United States on April 28, 2026
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Tiffani O
Boise, US
★★★★★ 5
Perfect for first baby books.
Format: Hardcover
Loved these for my first daughter a few years ago and they definitely got their use. I wanted to make sure I got a new set for my newborn. They are perfect for learning all the basics with large pictures that help them associate with the labeled word. Easy to travel with boards books that baby’s can hold as they learn to grip items.
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Reviewed in the United States on May 17, 2026
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Adam Altman
Louisville, US
★★★★★ 5
A wonderful little box set of books.thank you very much Adam Altman
Format: Hardcover
I bought this set of books for my friend's little girl.She's five years old, my friend.The parents of this little girl were very happy with the set.Their child absolutely loved the characters in this set of books. I wish this company came up with more sets like this.It would be wonderful for the little ones in the family I highly recommend this set excellent price an easy read Thank you very much Adam Altman
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Reviewed in the United States on May 15, 2026
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DK Bradley
San Leandro, US
★★★★★ 4
Realistic pictures, Good for vocabulary learning
Format: Hardcover, Format: Hardcover
Small and not very durable, but realistic and great for learning vocabulary. My 1yr old likes looking at the pictures and can handle the books well since they are small. If left unsupervised with them, they’d get destroyed. But it’s a good learning activity to do together. Would be nice if they were a little more durable but hey, they were cheap enough. I would pay more for a higher quality set.
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Reviewed in the United States on April 24, 2026

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