SKU: 85494496369

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: 85494496369

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4.3 ★★★★★
Based on 16 reviews
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Verified Purchase
Jennifer R.
New York, US
★★★★★ 5
Trust me - the few extra dollars is worth a shoe that actually stays on!
Size: 6 Little Kid, Color: Red/Blue/Lime
In an attempt to not spend lots on money on shoes for my toddler since they grow so fast, I ended up spending more money buying different "affordable" shoes and not a single one stayed on my little one's feet! The cost of these shoes is not outrageous but a little more than I wanted to spend on shoes that will be grown out of in a few months. Totally worth the few extra dollars though! Don't waste money and time trying to "save" money on shoes that don't work. Also, quality of the shoe is great. Got the red pair and they are adorable! My little one likes to run and these are holding up great! They stay securely on his fit and have plenty of room in the toe area.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 22, 2024
M
Verified Purchase
MK
Carnegie, US
★★★★★ 4
One month later - Pros & Cons
Size: 10 Little Kid, Color: Cobalt Blue, Size: 10 Little Kid, Color: Cobalt Blue
I purchased these shoes for my three year old son who is really hard on his shoes. I wanted shoes that were a good price value and that my son could put on and take off by himself, run around in, and that would stand up to 3 year old kid abuse. These shoes fit the bill, and for the price I would recommend them and I would buy them again, but they'd be even better if they were even more reinforced around the toes. **This is NOT a paid or subsidized review. If you find this review helpful, please click "yes" - thank you! PROS: * Price - these are a well made, good looking shoe for a very fair price. * Easy for my son to put on and take off, but do not fall off. Velcro is holding up well so far. * The velcro tab that holds them on is big, so there's plenty of room for error in putting them on, and there's plenty of velcro to ensure a good hold. * Nice looking - my son likes them which is a big deal when you're three. * Stand up well to rough and tumble play * Lightweight * Good grip on the soles of the shoes. * Fit is as expected, no discomfort, he wears them all day long without complaint. CONS: * As with all kids shoes, the toe area could be even more reinforced although he's worn them every day for a month and, as you can see in the pictures, they're not showing much wear. * VERY lightweight - so if you're looking for a heavier, more protective shoe for any reason, this is not the pair for you. Overall I'd highly recommend these shoes, and would purchase them again.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2016
A
Verified Purchase
Amazon Customer
Charlottesville, US
★★★★★ 5
Easy 2-Velcro closure
Bought the first pair at Kohls, was a favorite easy velcro closure for our 2.5 yr old Grandaughter. Wanted pink and Amazon had these. Perfect fit one half size up. They run a little narrow and smaller but are lightweight and easy for a toddler to put their own shoes on! Her favorite.
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Reviewed in the United States on August 9, 2025
D
Verified Purchase
Dylan Martin
Carnegie, US
★★★★★ 5
Perfect for my toddler
These shoes have been great for my 2yo! Easy on and off, stylish and affordable.
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Reviewed in the United States on December 16, 2025
M
Verified Purchase
morgan garcia
Massapequa, US
★★★★★ 5
run small.
Size: 7.5 Little Kid, Color: Peri
I was a fool and didn't size up, our daughter was only able to sue them for a minute. Should have sized up 2 sizes, I know better. A bit chunky too which I forgot about with these shoes, but fun color and easy to put on.
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Reviewed in the United States on October 4, 2025

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