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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4.1 ★★★★★
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Product Reviews
M
Verified Purchase
Mom2MKLx2
Alexandria, US
★★★★★ 2
Sad
Pattern Name: Strawberry
The outer part is good quality, the removable inside didn't last a day
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 29, 2026
A
Amazon customer
Los Angeles, US
★★★★★ 3
Didn’t hold up for more than a minute but the silicone strawberry by itself is durable.
Pattern Name: Strawberry, Pattern Name: Strawberry
Our best dog toy reviewer, a cattle dog mix, gave this toy a big thumbs up ONLY because she could demolish it in seconds. Not minutes, but seconds. The toy has a pouch stuffed into a silicone toy strawberry. The pouch is really stuffed in well, so much so that I couldn’t remove it, but she sure did! In about a minute all that was left was the dismembered strawberry “leaves” and a silicone strawberry which, oddly enough, she seems to enjoy. The silicone strawberry seems quite durable by itself. The toy is brightly colored and small in size. This not a durable toy unless you have a dog that is not an aggressive chewer, but for us, it is not recommended.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 15, 2026
T
Texas Pet Company
Belleville, US
★★★★★ 4
Good for larger treats, not small ones
Pattern Name: Carrot, Pattern Name: Carrot
Our dog loves this treat toy. It has been very durable as far as the rubber part goes but the cloth carrot insert not so much, that got torn apart pretty quickly. Also this works for bigger treats, but once the cloth carrot was destroyed, there was no way to keep small treats from just falling out. Now we use it to stick larger chew sticks in the holes and it works to help her keep it in place while chewing.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 11, 2026
K
KRR
Fort Morgan, US
★★★★★ 5
Dogs love these treat toys
Pattern Name: Strawberry, Pattern Name: Strawberry
I have big dogs who live for treats and love to play puzzle games to find treats. You can stuff these toys with small treats which gives your dog a mental challenge while working to figure out how to get them out. The quality of these toys are great but durability with big dogs will be short lived. The strawberry green top immediately was de-stuffed while dog was looking for more hidden treats. The corn husk seems to be more challenging for them to get the treats out. However my smarter dog was determined and eventually reaped the rewards. I would recommend these toys for dogs who will not rip them apart.... but really is there any pup who doesn't enjoy de-stuffing a stuffie squeek toy?
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Reviewed in the United States on May 14, 2026
K
Verified Purchase
K. Gardner
Lexington, US
★★★★★ 5
Great feeder for high energy puppy!
Size: Large, Color: Blue
I have a 50lb high energy puppy. She is not a fast eater, BUT she loves this activity and it gives me about 30 minutes of uninterrupted bliss. It took about 10 minutes to demonstrate to help her get the hang of it. She will sit, spin the barrel with her paw, then sniff every divider, only open the ones with her food, and then restart the process. It is sturdy and stays on the floor as she paws and pushes. It might move a little, but not far. This is my favorite puzzle toy by far and I love that it is "hard" enough to keep her occupied but not enough that she gets frustrated and doesn't want to do it.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 7, 2026

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