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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Ships within 48 hours · Estimated delivery Jul 7 - Jul 12

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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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Brian
Port Orchard, US
★★★★★ 5
My children occasionally need a really good nights rest.
Sometimes my kids need a good night's rest and this is my go-to product for that! The raspberry flavor makes it easy for them to take as well.
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Reviewed in the United States on August 6, 2024
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Wayneshia
Los Angeles, US
★★★★★ 5
First time
Works like a champ
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Reviewed in the United States on May 24, 2026
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Kindle Customer
Lexington, US
★★★★★ 5
Happily Surprised
These actually work as described! Very pleased
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Reviewed in the United States on March 29, 2026
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leslie Shaw
Natrona Heights, US
★★★★★ 3
Didn't Notice Difference
The taste is actually pretty good, honestly it's more like a treat than a supplement... but I haven't noticed any significant changes after going through the entire bottle. They didn't cause any upset stomach or side effects, which is a plus, but the overall benefits feel negligible.
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Reviewed in the United States on May 11, 2026
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Just Tell the Truth
Waukegan, US
★★★★★ 5
GREAT CONCEPT AND DESIGN
I bought these Feminine Balance Gummies because I was intrigued by the approach that was utilized. For me, I have been involved with lactobacillus formulas and probiotics with incorporating yogurt (the really healthy kind not the ones with a lot of advertising) to deal with yeast overgrowth. Typically I am experiencing a problem because I am consuming too much sugary foods (causing the body's resources to be depleted) or because I have taken a course of antibotics which killed both the good and bad bacteria in the body and now needs replenished. So, my first impression was the intrigued by the use of Pineapple as a part of the formulation, which is unusual but a good choice nonetheless because it is very beneficial for digestion and also for pain reduction. I liked the taste of the gummy, it tasted like Pineapple candy. The inclusion of Vitamin C seemed a bit of a stretch and is included to enhance the immune function. There are lactobacillus strains but the manufacturer has kept the strains used as a proprietary secret - which I find a bit frustrating as a consumer. Whatever it is, there is a billion of them (is this per gummie?). The manufacturer does support the use of vegan only products, it is also "clean" Halal, it is gluten free and allergen free. So, it appears they have carefully considered the inclusion of each ingredient for benefit. So here is the real test, yes, I have had the desired outcome by improving my "lady garden" and this is a very viable product in my opinion. I would recommend it to others.
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Reviewed in the United States on May 30, 2026

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